What is Ring: Definition and 1000 Discussions

In molecular biology, a RING (Really Interesting New Gene) finger domain is a protein structural domain of zinc finger type which contains a C3HC4 amino acid motif which binds two zinc cations (seven cysteines and one histidine arranged non-consecutively). This protein domain contains 40 to 60 amino acids. Many proteins containing a RING finger play a key role in the ubiquitination pathway.

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  1. A

    A Superconductor ring: shielding currents in different directions

    In this photo you see on the right-hand side that the outer wall current is negative and the inner wall current is positive. That is, they are directed in different directions. But if the applied magnetic field is in the z direction as shown, then shouldn't they both be in the same direction do...
  2. P

    Why Might a Rotating Ring in a B-field Ignore Certain Torques?

    Summary:: Please see the attached photo. I have obtained the correct answer, and my solution agrees with the official solution. However, I have some questions about why the solution is correct. (One may have to draw out some diagrams for this problem, it was quite hard to visualise for me.)...
  3. T

    Electric field inside a charged ring

    I am just a bit confused here. Would doing this even change the electric field direction at the center at all? I'm thinking no, but a bit of direction would be appreciated. This problem is really simple, I'm just a bit confused.
  4. P

    Does a charged insulating ring turn if a B-field is switched on?

    The physics behind this problem is that an electric field is induced (by Faraday's Law), when the B field is switched on. Charges on the ring now experience a force as given by dF = E dq. Apparently, because of this, the ring starts rotating. I understand that charges in an insulating material...
  5. A

    A charged conducting ring rotating B field -- referece frames

    Admittedly I found similar threads here already but due to my rather lacking math skills I wanted to go through this myself. As for the math side, I see various different equations with which this is treated can someone please provide the formulas for calculating B field from a rotating charged...
  6. ricles

    Tension in a rotating ring under gravity

    I know the solution for the problem of the tension on a rotating ring without gravity (tha is, ##\frac{mR\omega^2}{2\pi}##) - that I find simple enough. But I'm at a loss how can I change it to do with gravity :/ Any help is appreciated! (and apologies for the bad drawing)
  7. Olivia Lam

    What is the reaction force between the ring and the hoop?

    a.)N cos θ=mg N sin θ=mrw^2 sin θ cos θ=g/rw^2 b.) My question is reaction force =N ? or =F=mg tanθ ? If it is N then N=mg cosθ =mg^2/r w^2 or N=mg/cosθ =mrw^2 ? Thank you
  8. P

    Electrostatics: Calculate the Electric Field near a Charged Ring

    I have the problem with my solution. I don't know it is correct. Could somebody check it?
  9. jaumzaum

    Questions about magnetic levitation of a Thompson Ring

    The Thompson jumping ring experiment consists in an AC supply connected to a coil with a metal steel core inside. A metal ring is placed around the core. When the AC supply is turned on, the ring suddenly jumps and after a time it starts levitating in a fixed height. I'm a little confused about...
  10. A

    Equivalent resistance of a section of a graphite ring

    I considered that the lengths of pi/4 and 3pi/4 would be in parallel: 1/R = 1/30 + 1/10 R = 7,5 ohm But the answer is 30 ohm. Where am I missing and how do I calculate the potential of the voltmeter.
  11. Hamiltonian

    Total Potential of a Ring at Point P

    I tried finding the potential due to a small element dM of the ring let's say dV, the summation of dV for all the dM's of the ring will give the potential at the point P, but since every element dM of the ring is at a different distance from the point P I am unable to come up with a differential...
  12. E

    What is the tension in a charged ring?

    I tried considering a little piece of the ring (shaded black below) subtending angle ##d\theta##, and attempted to find the electric field in the vicinity of that piece by a summation of contributions from the rest of the ring: $$dE_x = \frac{dq}{4\pi \epsilon_0 d^2} \cos{\phi} =...
  13. C

    MHB How to prove an ideal of a ring R which is defined as a coordinates

    Hi Everyone, I am wondering how to prove an ideal of a ring $R$ which is defined as a coordinates. Let $R$ be the ring of $\mathbb{Z} \times \mathbb{Z}$. Let $I={(a,a)| a\in \mathbb{Z}}$. I determine that the $I$ is a subring of $R$. Next step is to show the multiplication between the elements...
  14. M

    B Descending a Rotating Black Hole: Hit the Ring Singularity?

    So I have been watching the latest edition of PBS Space Time ( I know, not a proper resource/guide,) and it seems to be a bit confusing as to whether you would hit the ring singularity at the center or not. On the one side he claims that the geodesics end there but on the other he claims you...
  15. A

    MHB Ideals of a ring of matrixes

    Hi. I have this ring of matrixes: R = { \[ \begin{pmatrix} a & 0\\ b & c\\ \end{pmatrix} \]}while a,b,c is from some field F. now, I need to find all the ideals of this ring. I found five ideals. here there are:i1 = { \[ \begin{pmatrix} 0 & 0\\ b & 0\\ \end{pmatrix} \]}i2 = { \[...
  16. T

    Magnetism Question about the MMF and a Steel Ring

    Summary:: This question is in relation to finding the mmf of a cast steel ring. Unfortunately I do not know how to post a picture of the page showing the graph. [Mentor Note -- Thread moved from the technical forums so no Homework Template is shown] A cast steel ring has a cross sectional...
  17. Physics lover

    Chemistry Ring contraction in a diazotisation reaction

    I know HNO2 favours diazotisation.So amine reacted and formed diazorised product with N+=NCl- which leaves and gives a carbocation to which OH- attacks.So according to me the answer should be cyclohexane-1,2-diol. But in the answer key,cyclopentane carboxyaldehyde was given as answer. I know it...
  18. BillTre

    I Universal interferometric signatures of a black hole’s photon ring

    This sounds interesting to me. I would appreciate the opinions of more knowledgeable and physics oriented forumists. The paper is in Science (I don't think its open access). Here is the abstract:
  19. S

    Ring attached to elastic and inextensible strings

    I imagine the system where P is in the middle between A and B, and P is also in the middle of light elastic string. Between P and B, there is tension force acting downwards on P. Between A and P, there is tension force acting upwards and because P is in the middle of the elastic string, there...
  20. F

    Polynomial ring zero divisors

    Proof: ##(\Leftarrow)## Suppose there exists non zero ##b \in R## such that ##bp(x) = 0##. Well, ##R \subset R[x]##, and so by definition of zero divisor, ##p(x)## is a zero divisor. (assuming ##p(x) \neq 0##). ##(\Rightarrow)## Suppose ##p(x)## is a zero divisor in ##R[x]##. Then we can choose...
  21. Kaushik

    To find the increase in the radius of a rotating ring

    The increase in radius is due to the centripetal force acting on the ring. The centripetal force acting on each point of the ring is directed towards its center. We can find force using ## F_c = M(\omega)^2R## We can use this ##F_c## in the equation of Hooke's Law to find the elongation Could...
  22. K

    Rotating and tilting charged disk induces a voltage inside a ring

    As I`` m learning for an upcoming exam I found an electrodynamics problem I struggle with. In the first task I need to calculate the magnetic dipole moment of a uniformly charged,thin disk with the Radius R and a total charge Q which rotates with a angular speed omega round its symmetry axis...
  23. Euge

    MHB Center of Ring $M_n(\Bbb C)$ - POTW

    Here is this week's POTW: ----- Compute the center of the ring $M_n(\Bbb C)$ of all $n\times n$ complex matrices. ----- Remember to read the https://mathhelpboards.com/showthread.php?772-Problem-of-the-Week-%28POTW%29-Procedure-and-Guidelines to find out how to...
  24. A

    How to calculate a pressure drop in a branch of a loop ring pipe

    Good day I'm trying to calculate the pressure drop in each branch of the following loop ring system I used the following formula to find the pressure drop but i seems that it worked only for the ring, and the branch #2 ( the branch in the middle), the solution given by the professor show...
  25. jisbon

    Find the velocity of a point charge in a ring of electric field

    Okay, I am not even sure how to startr with this question. But here's my theory: First I will need to the electric field produced by the ring using the formula: ##E = k\frac{\lambda a}{(x^2+a^2)^{3/2}}## After finding out electric field produced by ring, am I supposed to find out the...
  26. A

    I Relativistic Energy of Rotating Thin Ring: Quick Qs

    Quick question about the relativistic energy of a rotating thin ring, hoop or cylinder. Is there any reason why the relativistic energy would be anything different than ##E=\gamma_t m_0 c^2## where ##\gamma_t## depends on the tangential velocity ##v_t## observed by someone at rest with the...
  27. C

    MHB Group Ring Integral dihedral group with order 6

    Dear Every one, I am having some difficulties with computing an element in the Integral dihedral group with order 6. Some background information for what is a group ring: A group ring defined as the following from Dummit and Foote: Fix a commutative ring $R$ with identity $1\ne0$ and let...
  28. C

    MHB Finite vs Ring Groups: Examining Theorems

    Dear Everyone, Does every theorem that holds for finite group holds for ring groups? Why or Why not?Thanks Cbarker1
  29. J

    Oscillator Frequency of a Ring Oscillator with RC feedback

    I'm not sure how will this oscillator work. Assume A is low, so B will be high and the capacitor will charge through B-C- 2Mohm. Now even D has gone high, so A will be high and B will be low and C will discharge. I'm not sure how the voltage divider rule across RC will take into effect. I found...
  30. C

    MHB Problem (c) for Discrete Value Ring

    Problem (c) for Discrete Value Ring for a unit I am stuck in the middle of a proof. Here is the background information from Dummit and Foote Abstract Algebra 2nd ed.: Let $K$ be a field. A discrete valuation on $K$ on a function $\nu$: $K^{\times} \to \Bbb{Z}$ satisfying $\nu(a\cdot...
  31. metallurgy

    Creating a Custom Ring: Step-by-Step Guide

    Purpose is to make a ring.
  32. C

    MHB Discrete valuation Ring which is a subring of a field K Problem

    Dear Everyone, I am stuck in the middle of a proof. Here is the background information from Dummit and Foote Abstract Algebra 2nd ed.: Let $K$ be a field. A discrete valuation on $K$ on a function $\nu$: $K^{\times} \to \Bbb{Z}$ satisfying $\nu(a\cdot b)=\nu(a)+\nu(b)$ [i.e. $\nu$ is a...
  33. C

    MHB How can we prove that the center of a ring is a subring?

    Dear Everyone, I am stuck on a portion of the sub-ring criterion. The Problem states: "The center of a ring $R$ is $\{z\in R| zr=rz \ \forall r\in R\}$. Prove that the center of the ring is a subring that contains the identity as well as the center of a division ring is a field." I am doing...
  34. C

    MHB Unit of Ring Question - Cbarker1

    Dear Everyone, I am having trouble with an exercise problem. Here is the problem: Dummit and Foote Ed.2 pg 231: "Let $R$ be a ring with 1. Prove that if $u$ is a unit in R then so is $-u$." My Attempt: Suppose $u$ is a unit in $R$. Then, from Prop 1 (4) (if $R$ has an identity, then the...
  35. S

    I What's the difference between a ring and a field?

    They seem to mean the almost the same thing, with a field allowing subtraction & division whereas a ring only needs addition & multiplication. Is that a ring can mean "addition" & "multiplication" in some way that isn't between numbers per se, but between whatever abstract things can be dreamed...
  36. G

    Does an iron ring shield a static magnetic field?

    Hi. This picture shows an iron ring shielding a static magnetic field: Does this really work, and why? I know that a conductor can shield an electric field (Faraday cage) and a changing magnetic field (Lenz's law), but why would it shield a static field? Especially since iron is a ferromagnet.
  37. H

    MHB What distinguishes a Field from a Ring?

    What the differences between Field and Ring?
  38. Mr Davis 97

    Ring of continuous real-valued functions

    Homework Statement Let ##R## be the ring of all continuous real-valued functions ##f : [0,1] \to \mathbb{R}## with pointwise addition and pointwise multiplication of functions as its two operations. Let ##c \in [0,1]## and denote ##M_c = \{f\in R : f(c) = 0\}##. a) Show that any ##f\in R##...
  39. Mr Davis 97

    Showing isomorphism between fractions and a quotient ring

    Homework Statement For a commutative ring ##R## with ##1\neq 0## and a nonzerodivisor ##r \in R##, let ##S## be the set ##S=\{r^n\mid n\in \mathbb{Z}, n\geq 0\}## and denote ##S^{-1}R=R\left[\frac{1}{r}\right]##. Prove that there is a ring isomorphism $$R\left[\frac{1}{r}\right]\cong...
  40. G

    Zero Friction Piston Ring question

    I learned this in college too. I once know the name of these zero friction piston rings but I have forgot. If I knew the name I could do Google search and learn more about them. College professor said, grooves are .020" wide and .020" deep. Pressure drop across the grooves make them act like...
  41. Mr Davis 97

    I Can Multiplicative Cosets Form a Group for a Subring in a Ring Homomorphism?

    We know that kernel of a homomorphism consists of all the elements that map to the additive identity, 0. Here is my naive question: Why don't we define the kernel as all of the elements that map to the multiplicative identity, 1? Why isn't there a name for the set of all elements that map to the...
  42. J

    MHB Notion of a ring with identity 1=0

    Could someone clarify the notion of a ring with identity element $1=0$? Apparently it's just the zero ring, but then why do we always talk about a ring with identity $1 \ne 0$? It's like having to talk about prime $p \ne 1$; instead we don't define $1$ as a prime but also because we would lose...
  43. Mr Davis 97

    Showing that an element is a unit in a ring

    Homework Statement Let ##S=\{a+bi+cj+dk \mid a,b,c,d \in \mathbb{Z}\}## be the ring of integral Hamiltonian quaternions, where multiplication is defined using the same rules as in ##\mathbb{H}##, the ring of real Hamiltonian quaternions. Define a function $$N:S\to\mathbb{Z}...
  44. Krushnaraj Pandya

    Ring and solid sphere rolling down an incline - rotation problem

    Homework Statement A solid sphere, hollow sphere, disk and ring are released simultaneously from top of a incline. Friction is sufficient to prevent slipping of hollow sphere- what will reach the bottom first? Homework Equations a in pure rolling down an incline=gsinθ/(1 + I/mR^2) The Attempt...
  45. A

    Excess Heat Generated By a Liquid Ring Pump

    Hi all. First, some context. I work for a small seed oil extraction plant where we cold press the seed then solvent extract the residual oil from the presscake. In the solvent extraction plant we use liquid ring pumps to pull the required vacuums. The Plant Vac Pump (PVP) is used in all...
  46. cookiemnstr510510

    Derivation of electric potential charged disk from ring

    Homework Statement a)recall that electric potential is a scalar quantity. For a circular ring of radius, R', carrying charge, Q, what is the electric potential at a height,y, above the center of the ring? b)Use your above answer to determine the electric potential at a height,y, above the...
  47. Spinnor

    B Galactic Collision Creates a Ring of Black Holes and Neutron Stars....

    From, https://www.syfy.com/syfywire/wham-bullseye-galactic-collision-creates-a-ring-of-black-holes-and-neutron-stars ..."“So you have a nice, normal spiral galaxy, right, just out there doing its thing, when BAM! A smaller galaxy careens right through the middle of it like a bullet! Chaos...
  48. cookiemnstr510510

    Electric field of ring of charge/washer of charge/disk of charge

    Homework Statement Homework Equations charge density equations, electric field equations, The Attempt at a Solution My attempts are attached. The attachment labeled A, is part A. Part B took a lot of paper so there are two attachments labeled B1 and B2. It is really B and C that I am...
  49. S

    Uniformly charged ring on the axis

    Homework Statement The electric field on the axis of a uniformly charged ring has magnitude 360 kN/C at a point 6.2 cm from the ring center. The magnitude 19 cm from the center is 150 kN/C ; in both cases the field points away from the ring. Homework Equations 1. Find the ring's radius. 2...
  50. Krushnaraj Pandya

    Resonance energy per ring in benzene, napthalene, anthracene

    Homework Statement Compare resonance energy per ring in benzene, napthalene and anthracene Homework Equations -- The Attempt at a Solution I know Resonance energy of benzene is 36 KCal/mol, I also know anthracene is the most stable followed by napthalene so their resonance energy is in the...
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