# What is Charged rod: Definition and 58 Discussions

Guilty as Charged is a 1991 American comedy film directed by Sam Irvin and starring Rod Steiger and Lauren Hutton.

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1. ### Why Does the Electric Field Component Ex Require a Negative Sign?

hello i would like to understand to something. here is the drew now for my question: i was able to find Ey and here is my correct answer: when i try to find Ex i didnt understand something, i found the correct answer but i need to put minus before and i want to know why? here is my solution...
2. ### Experiment with an Electroscope, a Charged Rod and my hand

I know that if we bring a positively charged rod closer to the electroscope, charges of electroscope are separated and the leaves of the electroscope get away from each other. but what happens if we touch the positively charged rod with our hands and then move the hand and rod away?
3. ### Understanding the Interaction Between a Charged Rod and a Metal Sphere

(A) incorrect, because opposite signs attract, and the sphere would've been drawn to the charged rod. (B) correct, according to the answer key, but if the charge of the sphere and the charge of the rod are the same, then wouldn't they repel each other? I'm confused as to why this is the correct...
4. ### Surface charge on a conductor due to a charged rod 'q'

Homework Statement A charged rod of charge 'q' is at a distance 'd' from a perfect conductor as shown below. What's the total surface charge on the conductor? 2. Homework Equations I tried to solve this without equations. The Attempt at a Solution [/B] Basically, as long as there is E field...
5. ### Find electric field a distance P from a charged rod

Homework Statement The figure below shows a thin, vertical rod of length L with total charge Q. The indicated point P is a horizontal distance x from the one end of the rod. What is the electric field at point P. Express your answer in component notation in the two blanks below. L = 5.0 cm, Q...
6. ### Electrical field near infinite, charged rod

Homework Statement Calculate the electric field at point ##P## if the distance from the center of an infinitely long, charged rod to point ##P## is ##a = 0.6m##; the charge density equals ##\lambda = -CX^2##, ##C=10^{-3}C/m^3##. Show all steps in finding the equation of the field, then find the...
7. ### Gauss' Law: Charged Rod & Sphere (Electric Flux)

Homework Statement A charged, straight line/rod of infinite length has a Discrete uniform distribution of charge, has a linear density of λ and is at a distance d from a sphere with a radius of R. Find the entirety of the Electrical Flux that is caused by this charged rod, which passes...
8. ### How to Calculate the Electric Field at the Origin from a Uniformly Charged Rod?

Homework Statement A line of charge with a uniform density of 34.2 nC/m lies along the line y = -14.9 cm, between the points with coordinates x = 0 and x = 42.8 cm. Calculate the electric field it creates at the origin, entering first the x component then the y component Homework EquationsThe...
9. ### Electric Field of Uniformly Charged Rod at bisector

Homework Statement (Taken from Serway and Jewett Chapter 23, Q44, 9th Edition) A thin rod of length ## l ## and uniform charge per unit length ##λ## lies along the x-axis as shown in the image attached. (a) Show that the electric field at P, a distance d from the rod along its perpendicular...
10. ### Electric field due to a charged rod

Homework Statement https://gyazo.com/d502fb408d6224ffa70700cf047bad20 (link to problem: #4). [moderator edit: Image inserted for clarity] A total charge Q is distributed uniformly over rod length L. The rod is aligned on the x-axis, with one end at the origin and the other at point x=L. a)...
11. ### Metal sphere drawn and then repelled by charged rod

Homework Statement An uncharged metal sphere hangs from a nylon thread. When a positively charged, nonconducting glass rod is brought close to the metal sphere, the sphere is drawn toward the rod. But if the sphere touches the rod, the sphere suddenly flies away from the rod. Explain why the...
12. ### Electric field at (x,y) from uniformly charged rod.

Homework Statement A thin rod carries a charge Q distributed uniformly over its length L , and is situated on the x-axis between x=±L/2. Find the electric field at an arbitrary point (x, y). (You will have to do separate integrals for the x and y components.) Homework Equations ∫dE=∫kdq/r2...
13. ### Electric potential at center of charged rod

Homework Statement Find potential of a uniformly charged rod of length 2a Homework Equations -Superposition The Attempt at a Solution dV=\frac{kλdx}{r}, r=x V=λk\int\limits_{-a}^a \frac{1}{x}\mathrm dx=0 Potential at point B is zero. Is this correct?
14. ### Experiment of water defection with a charged rod

Homework Statement A student designs an experiment to measure how electrically charged a plastic rod is. She knows a charged rod will deflect a stream of water from a tap. The student plans to measure the angle of defection of the water stream when she brings the rod towards it. She expects...
15. ### Cylindrical Gaussian Surface around charged rod

Homework Statement a) 21.4-nC of charge is placed on a 4.8-m long steel tube with a d = 5.9-cm diameter. What is the magnitude of the electric field as a radial distance of r = d / 3? b) What is the magnitude of the electric field as a radial distance of r = 20 d? I was able to determine the...
16. ### Find electric potential at a center of charged rod

Homework Statement Find electric potential at a center of charged rod with charge 'Q' and length '2a' if referent point is at infinity. Homework Equations Electric potential of a point charge: V=kQ/r Electric potential via electric field: integral (Edl) The Attempt at a Solution I used...
17. ### Charge Rod Experiment: Why Didn't My Hand Neutralize?

In the charged rod experiment, why didn't my hand neutralize the charge formed in the rod, since my body is a conductor and it is connected to the Earth?
18. ### Find an expression for the electric field(Mastering Physics)

I just wanted to post a solution for anyone interested. Any notes on how to solve would be nice for others. 1. Homework Statement Mastering Physics (3rd edition) Problem 26.40 The figure (Figure 1) shows a thin rod of length L with total charge Q. Part A) Find an expression for the...
19. ### How Do You Calculate Electric Field Components of a Uniformly Charged Rod?

1. Problem Statement A uniformly charged rod of length L and total charge Q lies along the x-axis as shown in in the figure below. (Use the following as necessary: Q, L, d, and ke.) (a) Find the components of the electric field at the point P on the y-axis a distance d from the origin...
20. ### Finding the electric field of a charged rod

Homework Statement Homework Equations See above The Attempt at a Solution I messed with this for hours. I also searched all over the web and can't find anything that is similar. None of the problems I could find gave a value, they just gave lambda. Anyway, I have no idea what...
21. ### Finding electric field of a bent uniform charged rod.

1. Problem statement. 2. Known equations. E = k § dq/r^2 Lamda = Q/L 3. Attempt. I am having trouble figuring out the dq in this situation. I know that lamda = Q/L, and since those 2 are the variables that are changing I take the derivative of them so it looks like Lamda = dq/dL I...
22. ### Find a point charge a distance form a charged rod

Homework Statement See image Homework Equations KQ/r^2 The Attempt at a Solution I have seen several different ways of working this problem, but they have all failed on me. I tried this using the equation above from my book E = (8.99x10^9)(1036 C)/(4x10^-6m) E= 2.328x10^18 N/C I also...
23. ### Electric Field On A Point Charge Due To A Uniformly Charged Rod

Homework Statement This is regarding setting up an integral to calculate the electric field on a point charge that is at a distance "a" from a uniformly charged rod of length "L". I have attached a picture of my work, which includes a diagram of the problem, and wanted to know if my thought...
24. ### The Electric field due to a charged rod

Homework Statement A rod 14.0 cm long is uniformly charged and has a total charge of -22.0μC. Determing (a) the magnitude and (b) the direction of the electric field along the axis of the rod at a point 36.0 cm from its center. d (the distance between the center of the rod and the point)...
25. ### Potential of a non-uniform charged rod

Homework Statement A thin charged rod of length L lies along the x-axis as shown in the diagram below. The charge on the rod is distributed with a density of λ= c x (C /m) where c is a constant. What is the potential at a point (0,y)? (Your answer should be in terms k, c, L, and y). See...
26. ### Electric Field of a uniformly charged rod

Homework Statement A uniformly charged rod of length L and total charge Q lies along the x-axis as shown. Find the components of the electric field at the point P on the y-axis a distance d from the origin. There's also a part b but I should be able to figure it out easily enough...
27. ### Magnitude and Direction of E-field at a Point Due to a Charged Rod

Homework Statement There is a non-conducting charged rod with length L=.0815(m) and linear charge density λ=-5.9x10-14(C/m). The rod is placed parallel to and on the x-axis, and at a distance a=.12(m) from the right-most end of the rod is point P. Calculate the magnitude and direction of E...
28. ### A charged rod transfers electrons to a neutral conductor

An initially neutral conductor contains a hollow cavity in which there is a + 65.0 nC point charge. A charged rod transfers - 75.0 nC to the conductor. Afterwards, what are the charges along the inner surface and the exterior surface? I understand that the charges from the rod are equally...
29. ### Force exerted by a charged rod on a point charge

Homework Statement Determine the electric force exerted on a negative point charge –Q located a distance d away from a line segment of charge, extending from –L/2 to +L/2 along the x-axis. The line segment has a non-uniform charge distribution, lambda(x)=lambda_0*x . Homework Equations...
30. ### Electromagnetism: Finding Electric Field of non Uniform Charged Rod

Homework Statement Here is the question: Thin rod AB has length l=100 cm and total charge q=37 nC that is distributed in such a way that its line density ? is proportional to the square of the distance from the end A, i.e. ?(x) =kx^2. Determine electric field E at the end A of the rod. ...
31. ### Electric Field on finite charged rod

Homework Statement Thin rod AB has length L=100 cm and total charge q0=37 nC that is distributed in such a way that its line density \lambda is proportional to the square of the distance from the end A, i.e. \lambda(x) =kx^2. Determine electric field E at the end A of the rod. Homework...
32. ### Electrostatic force between a charged ring and charged rod.

Homework Statement a) Calculate the electrostatic force on an uniformly charged rod of length 2L and charge q, which lies along the axis of an uniformly charged ring of radius R and charge q'. The centers of the charged rod and the rings are displaced at a distance z= z0. b)Show that if z0 >>...
33. ### Potential of a point from charged rod.

Homework Statement Hello, the problem i have with finding the potential is the integration limits. Assuming both the rod and point lies on the x axis. When i integrate the sum of many slices of rod, ill get 2 answers(negative and positive) depending on the limits i use. Example i ended up...
34. ### Potential from uniformly charged rod: signs and limits of integration

Homework Statement http://www.phys.uri.edu/~gerhard/PHY204/tsl330.pdf full solution here Homework Equations The Attempt at a Solution Here is solution of problem for positively charged rod. What will be the difference if I take negatively charged rod? Why I start integration from d...
35. ### Magnetic field of a charged rod

moving charged particles created a magnetic field perpendicular to their motion I believe. Anyways If you where to give a metal rod a positive or negative charge and spun it really fast would you created a noticeable magnetic field as a result of the moving rod as a whole? Its just a thought...
36. ### Finding the magnitude of the eletric field of a uniformly charged rod.

Homework Statement "A rod of 13.1 cm long is uniformly charged and has a total charge of -23.2 micro coulombs. Determine the magnitude of the electric field along the axis of the rod at a point 52.1575 cm from the center of the rod. The Coulomb constant is 8.98755e9 N M^2/C^2. Answer in units...
37. ### Charged rod in your hand stays charged

Homework Statement When you rub a rubber rod with fur it becomes negatively charged. How does it keep it's charge if it's in your hand? Homework Equations The Attempt at a Solution We did this in the lab and it definitely stays charged (at least long enough to observe some...
38. ### Finding Electric Field on the Bisector of a Non-Uniformly Charged Rod

This question has been giving my brain some trouble. I think i have the Electric Field integral calculated correctly (but I'll post that up here too just in case I'm wrong which is likely) but when I get down to finding the charge on the rod I literally am making a wild guess at the solution...
39. ### Electric field due to a uniformly charged rod

hi, here's the question: a rod in the xy plane has it's ends at (0,0) and (L,0). It has a uniform charge per unit length (lambda). Find the electric field on the x-axis for 0 < x < L. solution attempt: dEx = dE = kdQ/r^2 dQ = lambda*ds = (Q/L)*dx now i took my r = (L - a -...
40. ### Need help with Proper integral of a uniformly charged rod

Homework Statement A uniformly charged rod is places along the x-axis from x=0 to x= L. carefully set up, but do not solve the proper integral to determine the x component of the electric field at the point (L,a) Homework Equations E=u \int \frac{dq}{(r^2)} for a line dq=λdl The Attempt at...
41. ### Electric field of an infinite charged rod

Homework Statement I tried to derive the electric field of an infinite (non conductor and conductor, I believe it is the same) charged rod. Homework Equations \oint \vec E d \vec A = \frac{Q_{\text {enclosed}}}{\varepsilon _0}.The Attempt at a Solution I could do all, except at the end...
42. ### Electric Field of a charged rod

Homework Statement The figure below is a section of a conducting rod of radius R1 = 1.30 mm and length L = 11.00 m inside a thick-walled coaxial conducting cylindrical shell of radius R2 = 10.0R1 and the (same) length L. The net charge on the rod is Q1 = +1.50 10-12C that on the shell is Q2...
43. ### Finding the force due to uniform charged rod

Homework Statement A charge Q = 4.35 ×10−4 C is distributed uniformly along a rod of length 2L, extending from y = -21.1 cm to y = +21.1 cm, as shown in the diagram 'on your assignment above. A charge q = 6.05 ×10−6 C, and the same sign as Q, is placed at (D,0), where D = 74.5 cm. Use...
44. ### Potential Difference Near a Charged Rod

Homework Statement A long rod of length L = 7.8 m carries a uniform charge Q = -6.5e-08 coulombs. Calculate the potential difference VC - VA. The distance c is 4 cm, the distance b is 11 cm, and the distance a is 4 cm. Only part of the rod is shown in the diagram (it is longer than shown)...
45. ### Uniformly charged rod in an arc

If a rod with charge density lambda is bent into a 3/4 circle what is the E field at the center? Well if the rod is 3/4 of a circle then neither the x or y components can cancel out, thus E= k*lambda/ R (i) + k*lambda/R (j) right?
46. ### Uniformly charged rod concept question

If a uniformly charged rod is bisected in the middle the limits of integration would be (-L/2) to (L/2)? Thus the formula would be the integral from (-L/2) to (L/2) of k*dq/r^2. Now of course there might be an angle so cos(theta) and sin(theta) would need to be added. If the point at which we...
47. ### [PhD Qualifier] Charged rod above metal plate

Hey ... I'm trying to study for my PhD qualifying exam, and I have a bunch of questions from previous years, but no answer keys. Homework Statement A think uniformly charged rod of length L is positioned vertically above a large uncharged horizontal thick metal plate. The distance between...
48. ### Very Simple = a negatively charged rod will only attract what?

I'm having a hard time about a negatively charged rod and the objects it will attract. It's true that the rod will only attract positively charged objects, correct? here's what I have to answer in my exam. To explain the attraction which a rubbed rod of amber exerted on small...
49. ### Finding Torque Applied to a Charged Rod in an External Electric Field

A long, thin rod (length = 4.0 m) lies along the x axis, with its midpoint at the origin. In a vacuum, a +8.0 µC point charge is fixed to one end of the rod, while a -8.0 µC point charge is fixed to the other end. Everywhere in the x, y plane there is a constant external electric field...
50. ### Calculating E-Field Close to a Metal Plate from an Infinite Charged Rod

Homework Statement An infinite, thin, uniformly charged rod (charge density lamda) is situated parallel to a metal plate at a distance d above it. Calculate the E-field close to the surface of the plane as a function of perpendicular distance to the rod. The Attempt at a Solution I...