Electrostatic Definition and 857 Threads

Homework Statement An electron beam in the TV tube is steered across the screen by the field between two charged plates. If the electron experiences a force of 3.ox10(to the negative 6th)N, how large is the field between the deflection plates? 2. Homework Statement The custodian dusts...

1. If the potential difference across the nerve of a frog is 85mV and its resistance is 2.5x10^2 Ω what current will flow through the nerve? Answer: 3.4x10^ -4 2.If all other factors remained the same, what change in resistance would result if the radius of a wire were doubled? Answer...

In a pith-ball electroscope, a ball made of pith, which is a light-weight electrical insulator, is suspended from a hook via a silk thread. When the electroscope is placed in the vicinity of a negatively charged object on the right, the ball moves towards the object. What is the direction of...

Homework Statement Point A is at an electrostatic potential of +1V relative to point B in a vacuum. An electron initially at rest at B moves to A. What is its velocity in m/s? Homework Equations E = PE + KE PE= J/q * q KE = 0.5 mv^2 (where v = velocity) The Attempt at a Solution...

Homework Statement How much work is required to exchange the positions of q2 and q3? q2 q3 q1 q1 and q2 are separated by a distance of 4.00 cm and q2 and q3 are separated by a distance of 2.00cm The charge on q1 is 5.00nC, q2 is -5.00nC and q3 is 10.0nC Homework...

so today we had a test about electrostatics. here was the question: a positive charged rod (ungrounded) is to the left of 2 metal conducting spheres, that are initially touching each other. Each metal conducting sphere is hung by a string (which is an insulator). What is the charge of each...

Homework Statement Two spherical shells of radius ‘a’ and ‘b’ (b>a) are centered about the origin of the axes, and are grounded. A point charge ‘q’ is placed between them at distance R from the origin (a<R<b). Expand the electrostatic potential in Legendre polynomials and find the Green...

I have two plate capacitors serially connected in a circuit with a battey and a switch between the battery and one of the plate capacitors. I have two situaions: a) I charge the capacitors, cut the switch, and double the internal distance in one of the capacitors. b) I charge the...

I can't understand what actually is the electrostatic potential.The definition given in my textbook is as follows : "Electrostatic potential at any point in a region of electrostatic field is the minimum work done in carrying a unit positive charge from infinity to that point without...

There is one thing I don't understand about this and is that besides the Dirichlet and Neumann conditions there seems to be a third one which is important when the method of images is used and is never mentioned. The problem is that Newmann condition requires especification of \frac{\partial\phi...

I am just an electrician doing experimental work with a Stubblefield coil. From what I've read the most common steel is 1018. If Stubblefield used a common bolt I assume this would fall into the 1018 realm. Would the 1018 iron core be better cold rolled or hot rolled for the magnetic collapse as...

Two positive point charges, each of which has a charge of 1.5 × 10−9 C, are located at y = +0.50 m and y = −0.50 m. The Coulomb constant is 8.98755 × 10^9 N · m2/C2. a) Find the magnitude of the resultant elec- trical force on a charge of 1.0×10−9 C located at x = 0.55 m. Answer in units...

http://farside.ph.utexas.edu/teaching/em/lectures/node56.html By equation 595, electric energy in the universe caused by an electric field is derived as http://farside.ph.utexas.edu/teaching/em/lectures/img1261.png. However, how come you can differentiate with respect to volume and say that...

Hi Everyone! I'm new to this forum, and English isn't my first language - I would really appreciate your help with this question :) Homework Statement http://img225.imageshack.us/img225/3807/1milliontotheground.jpg there are given 2 thin shells with radiuses b and c, and a full sphere...

Hello I wanted some feedback on the idea I have about this electrostatic motor. One thing not mentioned is that the electrostatic field of the Earth is changing from day to night because of the ionization from solar rays is stronger during the day. Yet I wonder if the motor would stilll run for...

Homework Statement Two parallel plates are positioned horizontally and when the potential te?difference between the plates is 400 V, a charged particle is suspended freely 10 cm above the lower plate. If the potential difference is suddenly changed to 200 V, how long will it take the particle...

Homework Statement Two concentric spherical shells. The outer shell is split into two hemispheres at potentials +Vo for the upper half and -Vo for the lower half. The inner shell is at zero potential (see attachment). " what is the potential in the region; r > R' " (the potential in the...

Homework Statement Homework Equations potential, V = kq/r where k is 1/4 pi epsilon conservation of charge, sum of q = Q The Attempt at a Solution what i did is let q1 + q2 + q3 = 4*10^-4 then let V1 = V2 = V3 and solve for q3 but i end up getting q3 = 0.0002 which is...

Well, say there is an positive particle, and a negative particle. Newton said one is pulling the other, and thus it is pulling back. But we now know both particle actually creating fields, and the fields actually exerting the force on the other particle. so basically, this is not action...

Homework Statement How far (in cm) apart must be proton from group of 13 protons if the magnitude of the electrostatic force acting on either one due to the others is equal to the magnitude of the gravitational force on a proton at Earth's surface? So, I know that the mass of a proton is...

If I have a picture of the field lines of a field, how do I tell if the field is a possible electrostatic field? What are some things to look for that would imply it either is or is not a possible electric field?

The formula for Coulomb's force is F = k \frac{q_{1}q_{2}}{r^{2}}, which represents how the force varies as the inverse square of distance between like or unlike charges. Does it mean the repulsive force between like charges decreases as the inverse square of distance?

Textbook: "Chemistry" by Silberberg. 5th Edition. Page 306 "Electrostatic effects play a major role in determining the energy states of many-electron atoms." Can someone help me understand this statement? "Electrostatic effects" is not in the textbook glossary, and I'm not having luck...

Homework Statement Determine the total electrostatic potential energy of a conducting sphere of radius r_0 that carries a total charge Q distributed uniformly on its surface. Give your answer in terms of Q, r_0, epsilon_0 and appropriate constants. Homework Equations The Attempt at...

Homework Statement A spherical conductor of radius 2 m is charged to 120V. It is now placed inside another hollow spherical conductor of radius 6m. Calculate the potential to which the bigger sphere would be raised if the smaller sphere were made to touch the bigger sphere. Homework...

b]1. Homework Statement [/b] A see-saw with a central pivot is made of insulating material. the left hand side supports a conducting sphere of charge Q= 5.0x 10-6 which experiances an electrostatic force from an idetical sphere 10cm below with +Q the right end has anouther conducting sphere of...

Homework Statement A test charge +q is brought to a point A a distance r from the center of a sphere having a net charge +Q. Next, a test charge +2q is brought to a point B a distance 2r from the center of the sphere. Compared with the electrostatic potential at A, the electrostatic potential...

Homework Statement Four idential charged spheres are located at the corners of a square with side length 2a. The spheres are much smaller than the size of the square (r<<a) and each sphere has a mass m and carries the same charge -Q. a) What is the total electrostatic potential energy of...

Homework Statement Two very long hollow conducting cylindrical shells are situated along the x-axis. The shells are concentric and have negligible thickness. The inner shell has a radius a and a linear charge density +lambda, while the outer shell has a radius b and a linear charge density...

Something occurred to me just now. A question about the scalar potential. First I will do some calculations of the laplacian of the scalar potential in different electrostatic situations to give myself a basis for my question. Point charge: \phi =\frac{1}{4\pi\epsilon_0} \frac{q}{r}...

I am currently looking for a particular material that becomes strained under electrostatic or magnetic fields. I am new to the world of solid state physics and I was interested on doing a research project on the studies of the electrostriction effect. Thank You

Say I have a packet of electrons just sitting there, before they repel each other, what is their potential energy? I have no idea of how to calculate their potential energy since at r = 0 , U = infinity, which is not helpful since my problem requires U to be finite but the only way I know of...

Electrostatic force problems, help urgent! Homework Statement Question: An isolated hollow metal sphere of radius 40 cm carries a charge of -10*10^-6. What is the magnitude of the electric field E (a) in the empty space inside the sphere and (b) 60 cm from the center of the sphere ( no...

Homework Statement http://www.freeimagehosting.net/uploads/3e00ce8695.gif Homework Equations Electric field equation derived from Coloumb's Law (given on the screenshot above). The Attempt at a Solution Solution is given in the form of answer sheet...

An alpha particle (made of 2 protons and 2 neutrons) with initial kinetic energy of 1.20 × 10^-12 J travels directly towards the nucleus of the stationary zinc atom The nucleus of a zinc atom contains 30 protons and 35 neutrons, and has a diameter of 4.00 × 10^-13 cm. The alpha particle slows...

Homework Statement I have a homework question on electrostatic seesaws. My problem is the algebra. Homework Equations I have been following another example and any guidance to help me proceed would be great. 0= (2q Q)/(4πε_o r²)+(q Q)/(4πε_o r²)-m 0= (3q Q)/(4πε_o r²)-m m=(3q...

Homework Statement Three particles P1, P2, and P3 are located at the points (−2.00, −1.00), (0, 2.00), and (3.00, −1.00), respectively. P1 has a charge of 5.00 μC, but the charges of P2 and P3 are unknown. However, the three particles exert no net force on a charged particle that is placed at...

Homework Statement I'm having hard time seeing that from this picture: Follows that: \phi(\vect{r})=\frac{q}{4\pi\varepsilon_0}\cdot\frac{1}{|\vec{x}|} The thing that puzzles me isn't the equation but this...

Homework Statement A. Find the electrostatic force between a Na+ ion and a Cl- ion separated by 0.5 nm. B. Would the answer change if the sodium ion were replaced by Li+ and the CL ion by Br-?Explain. Homework Equations I believe you have to use Coulomb's Law...? F=k* [(/q1//q2/)...

Homework Statement A particle of charge of +4.20 x 10^-6 C is 12.0 cm distant from a second particle of charge of -1.70 x 10^-6 C. Calculate the magnitude of the electrostatic force between the particles. Homework Equations Coulombs law is F = (K*Q1*Q2) / R^2 where k = 8.99*10^9, q1...

Homework Statement Calculate the (electrostatic) force between a Ca2+ and an O2– ion the centers of which are separated by a distance of 1.25 nm. Homework Equations I know that: Coulomb's Law is F = (k q1 q2)/r2 Attractive Force is F = (k z1e z2e)/r2 where z1 and z2 are the valence...

Homework Statement Given an electrical dipole of electrical dipole momentum \vec P = p\hat k, centered in 0\hat i + 0\hat j + 0\hat k, find the potential in all the space, where V(\infty ) = 0. If the dipole is now surrounded by a hollow spherical conductor (initially discharged), find the...

Take a capacitor arrangement...the capacitor having 2 plates which are square shaped. Assuming one of the plates as A and the other as B. If A has been given a static charge, it can be said that the all energy possessed by A can be computed when A is discharged...overall discharging will...

Dear all: I am going to design a cantilever switch which is working with electrostatic (capacitive) force. I want to design that. That is to find the dimension and material of that. I was wondering if you could kindly suggest a reference for designing this. Thank you very much.

Hey guys, I need some help on my research assignment which was dumped upon me during finals week. Thank you research leader for unloading your anger upon this poor undergrad. Anyways, I'm in a project to construct an electrostatic trap... and to model it in matlab. I figure I should try to do...

Came across it when I was studying about Cathode ray oscilloscopes, it says that two sets of parallel plates are kept at a high pd with another one of relatively lower pd between them. Then electrons from an electron gun are shot into it. It says that the electrons are focused on the cro's...

simple eg: negatively charged van de graaff generator top and a magnet. Put magnet near top. Would the magnetic field push the electrons of the charged surface to the sides and deeper into the metallic top?

Homework Statement Calculate the ratio of the magnitude of the attractive gravitational force to the repulsive electrostatic force between two protons. Homework Equations Mass of proton = M = m = 1.672e-27 kg g = 9.80665m/s2 Q = q = 1.60219e−19 C k = 8.9875e9...

This is from Sadiku's Elements of electromagnetics. I have come to a result but it's different from that of the book. Homework Statement Three identical small spheres of mass m are suspended by threads of negligible masses and equal length l from a common point. A charge Q is divided...

Hey there, I am just seeking some clarification wrt the notation that I have come across for the Electrostatic Field: \mathvf{E}(\mathbf{r})=\frac{1}{4\pi\epsilon_0}\int\int\int_V\frac{\rho(\mathbf{r'})\hat{\mathbf{u}}(\mathbf{r'})}{|\mathbf{r}-\mathbf{r'}|^2}\,dV' So are all of the...