# What is Conducting sphere: Definition and 114 Discussions

Conduct books or conduct literature is a genre of books that attempt to educate the reader on social norms. As a genre, they began in the mid-to-late Middle Ages, although antecedents such as The Maxims of Ptahhotep (c. 2350 BC) are among the earliest surviving works. Conduct books remained popular through the 18th century, although they gradually declined with the advent of the novel.

View More On Wikipedia.org
1. ### Line of charge and conducting sphere (method of images)

I was thinking of using the sphere and point charge as an analog, but is quite diferent from what i have seen

..
3. ### What happens when a conducting sphere rubs against metal?

I know that metal is a "reservoir" of electrons, whereby electrons can flow out and in easily, so when conducting sphere is rubbed against metals, is there even a resulting charge on the conducting sphere?
4. ### Electric Field inside the material of a hollow conducting sphere

Let's say I place a positive point charge inside a hollow conducting sphere. If we take a Gaussian surface through the material of the conductor, we know the field inside the material of the conductor is 0, which implies that there is a -ve charge on the inner wall to make the net enclosed...
5. ### Reducing the charge Q on an isolated charged conducting sphere to Q/8

It seems to me that one can obtain the required result by using just one neutral sphere and one ground wire. Let A be the charged sphere and B be the neutral one. Initially ##Q_A=Q## and ##Q_B=0##. put A and B in contact. As a result ##Q_A=Q/2## and ##Q_B=Q/2##. ground B, so that ##Q_B=0##...
6. ### Electric field direction on a grounded conducting sphere

I am required to find the direction of the electric field on the surface of a grounded conducting sphere in the proximity of a point charge ##+q##. The distance between the center of the sphere and the point charge is ##d## and using the method of images we find that the charge of the sphere is...

8. ### Electrodynamics: Conducting sphere of radius R cut in half

Summary: Electrodynamics: Conducting Sphere cut in half to form a gap, and a charge q is placed on the first half-sphere. Find all four σ. A sphere of radius R is cut in half to form a gap of s << R (ignore edge effects) - the first hemisphere is charged with q, and the second hemisphere is left...
9. ### Potential from point charge at distance ##l## from conducting sphere

After looking around a bit, I found that, considering the polar axis to be along the direction of the point charge as suggested by the exercise, the following Legendre polynomial expansion is true: \frac{1}{|\mathbf{r} - \mathbf{r'}|} = \sum_{n=0}^\infty...
10. ### Potential across a conducting sphere surrounded by an insulator

Homework Statement A conducting sphere has a radius of 2.25 m and carries a positive surplus charge of 35.0 mC. A protective layer of barium titanate is applied to the surface of the sphere to make it safe for laboratory workers nearby. Safety considerations dictate that the potential...
11. ### Question about a conducting sphere in a varying magnetic field

Homework Statement 3. A spherical conducting shell is placed in a time-varying magnetic field. Is there an induced current along the equator? Homework EquationsThe Attempt at a Solution I don't know what is the right answer. I mean...why not? Is the magnetic field is changing, there should be...
12. ### Path of a conducting sphere through a uniform magnetic field

Hello, could someone help answer this question for me: How would the path of a conducting sphere (i.e. AL) be affected as it passes through a strong uniform magnetic field orthogonal to the direction of motion. I believe the Lenz effect/Eddy currents will create a magnetic field opposing the...
13. ### Calculate the electric field in all of space for a non conducting sphere

Homework Statement A) Use Gauss's Law to derive the electric field in all space for a non-conducting sphere with volumetric charge distribution ρ=ρ0r3 and radius, R. B) Repeat when there is a concentric spherical cavity within the non conducting sphere with radius, A. Homework Equations...
14. ### Conducting Sphere With Cavity E-field / Gauss' law

Homework Statement You have a conducting sphere that is in equilibrium, it has a cavity in it with positive charge +q. If you bring another charge +q2 near the outer edge of the conductor does the total surface charge on the wall of the cavity, q(int) change? There is an image attached that...
15. ### Conducting sphere Find the electric filed for r<a,a<r<b,r>b

Homework Statement Homework Equations The Attempt at a Solution for part ii) a<r<b E=0 I am not sure what will be the difference between the formulas for the electric field for a<r and a>b I think the formulas will look the same: The only difference that I can think of is that when r<a...
16. ### Inductance of a Solenoid Around a Conducting Sphere?

I got into a little debate about the nature of a problem where you put a giant solenoid around the equator of Mars to give it a magnetic field (not my idea, I like futuristic things but... there are probably better things to worry about). Anyways, I got into a debate about the effect of the...
17. ### On charge image method over a conducting sphere and its Char

Hi colleagues, I need your help to figure out some subtle theory problmes I have about this topic. I was thinking about a system composed by a conductive sphere (not grounded) under the effect of a pont charge placed near the sphere. As I know we need two image charges to satisfy the boundary...
18. ### Point charge outside a grounded conducting sphere

Homework Statement Homework EquationsThe Attempt at a Solution Option (a), because the potential is 0 on the surface, and potential due to point charge is positive so there must be negative charge on the surface. Since opposite charges attract each other, there is an attractive force...
19. ### Conducting sphere with chrage in centre

Homework Statement Consider a conducting sphere of radius ##R_1##. Inside it there is a cavity, spherical in shape, with it origin at the same point as the conducting sphere and of radius ##R_2## ##(R_1>R_2)##. Assume there is a point charge equal to ##+Q## at the origin. Use Gauss law to...
20. ### Method of images, charge q inside conducting sphere

Homework Statement Using the method of images discuss the problem of a point charge q inside a hollow grounded conducting sphere of inner radius a.Find (a) the potential inside the sphere (b) induced surface-charge density (c) the magnitude and the direction of force acting on q is there any...
21. ### Jackson's 6.4 - Uniformly magnetized conducting sphere

Homework Statement A uniformly magnetized and conducting sphere of radius R and total magnetic moment m = 4\pi MR^3/3 rotates about its magnetization axis with angular speed \omega. In the steady state no current flows in the conductor. The motion is nonrelativistic; the sphere has no excess...
22. L

### B Why is resistivity important in solving this problem?

In free space there are two masses: - Metallic sphere of mass M, radius R and total charge equal to 0. It has also a resistivityρ. - Metallic sphere of mass m, radius r and charge q. The distance between the masses is D. We can assume r <<R<<D and m<<M. The masses start accelerating until they...
23. ### Attractive force between a charge q and neutral conducting sphere

Homework Statement I uploaded the Ex. 3.2. Homework EquationsThe Attempt at a Solution On the spherical surface, the potential due to q'' at center is going to be constant. q''= V0 R\kLet's say that the potential of the neutral conducting sphere is V0. Now, to calculate the force of...
24. ### Why is the electric field within a conducting sphere 0?

Given a charged sphere, the electric field within it is zero at every point. Why is this? Why is not merely zero only at the center? If a sphere is conducting, then its charge is all across the surface. If electric field is inversely proportional to distance from charge squared, won't the field...
25. ### What Is Incorrect About Grounding in Electromagnetic Theory?

Homework Statement A point charge +q is placed outside a grounded conducting sphere of radius a. which of the following is ##not## true. a) There is an attractive force between the sphere and the charge b) The induced surface charge density on the sphere is not same everywhere c) The electric...
26. ### A neutral conducting sphere and an insulating sphere....

Homework Statement Homework Equations None The Attempt at a Solution My thinking was that the positively charged sphere would repel the electrons to the far side of the neutral sphere, creating a repulsive force between the two spheres until they touch and the charge is shared. Since the...
27. ### Potential of a conducting sphere in a conducting shell

Homework Statement A conducting sphere, radius R, charged with Q is inside a conducting shell (2R<r<3R) with charge 2Q. Find the electric potential and the energy. Homework Equations \Phi =-\int_{r_1}^{r_2} \vec{E}\cdot\vec{dl} U=\int_{V}E^2dV The Attempt at a Solution I think i got it...
28. ### Electric Potential at Center of Sphere

Homework Statement A solid conducting sphere of radius R and carrying charge +q is embedded in an electrically neutral nonconducting spherical shell of inner radius R and outer radius 9 R . The material of which the shell is made has a dielectric constant of 2.0. Relative to a potential of zero...
29. ### I Why is the E-field inside a solid conducting sphere zero?

The common explanation is this: If the conductor has a net charge, then the charges repel each other until they arrange themselves symmetrically around the outside of the sphere, and if you do the math the electric field will cancel out everywhere inside the conducting sphere. Alright, but what...
30. ### Is it possible to charge a conducting sphere from the inside

Hello.. i just saw this amazing Forum and wanted to contribute, so here is my first question and i hope i get an answer x.d I was told that at electrostatic equilibrium, the electric field inside a conducting sphere will be ZERO, How can i charge thissphere from the inside, so the Electric...
31. ### Potential at a point due to conducting sphere and sheet

There's this question, A conducting sphere of radius R and charge Q is placed near a uniformly charged non conducting infinitely large thin plate having surface charge density σ. The potential at point A on sphere due to charge on sphere is? I have uploaded the picture. Now I know the net field...
32. ### An insulating sphere inside a conducting sphere questions

I've been given a copy of my friend's midterm exam from this same class from last term, and decided to take a crack at it to help study. One question type in particular really messes me up and it looks like the following. How would I go about solving these in the future? A solid insulating...
33. ### Charge and energy of a conducting sphere

Homework Statement A conducting sphere of radius 100cm is charged to a potential of 30 volts. a) What is the charge on the sphere? b) What is the energy stored in the field? c) If the sphere is connected to a second identical uncharged sphere by a long wire, what is the final energy in the...
34. ### Finding potential of conducting sphere

Homework Statement Find the potential at the centre and at P of a hollow uncharged conducting spherical shell if a charge q is placed at a distance of 2r from centre of shell. (r is the radius) Homework Equations All the charge induced on the sphere has to reside on the sphere's outer...
35. ### E=0 inside the conducting sphere Always?

An uncharged metal sphere suspended by a silk thread is placed in a uniform external electric field E.(a)What is the magnitude of the electric field of points inside the sphere?(b)Is your answer changed if the sphere carries a charge? I would have asked this in homework forum but it does not...
36. ### Potential inside a grounded conducting sphere

Homework Statement Hi, I'm currently answering a problem in Jackson's electrodynamics. The question is: Given a point charge q inside a hollow. grounded, conducting sphere of inner radius a. Find the potential inside. This can be solved by placing an image charge outside the sphere, and...
37. ### Conducting sphere within a conducting shell

Homework Statement A hollow spherical shell (B) with inner radius R2 and esternal radius R3 is negatively charged with Q. A spherical conducter (A) with radius R1 is placed within the the shell. A is charged with Q. The centers of both shells coincide. Then a negative point charge q is placed...
38. ### Electric field on the surface of charged conducting sphere?

just above the surface it's (kq/r^2) where r is the radius of the sphere and just below the surface it's zero, so is the electric field zero also exactly on the surface ? (as the q enclosed then will be zero since the flux is coming from the surface and not actually penetrating it) and...
39. ### Electric field inside charged conducting sphere?

i know it s zero because of the electrostatic equilibrium, but in terms of point charges : from the charge distribution on the sphere surface if we consider 2 point charges opposite to each other in direction : it s logical that at the point in the mid distance between them the electric field...
40. ### Potential of a Charged Conducting Sphere

Homework Statement A conducting sphere with radius R is charged to voltage V0 (relative to a point an infinite distance from the sphere where the potential is zero). What is the surface charge density σ? Express your answer in terms of the given quantities and ϵ0. Homework Equations Electric...
41. ### Electric potential of hollow conducting sphere

Homework Statement A charge conducting hollow sphere and a point charge with radius of sphere and distancestors between their centers Homework Equations [/B] 3. The atempt at a solution I am unable to find the potential of Shere in presence of external point charge
42. ### Charges inside conducting sphere

Homework Statement Three fixed point charges of +2 nC, −3 nC and +4 nC are located inside a thin uncharged metal spherical shell of radius R = 2 cm, as shown in the picture attached. Calculate the strength and direction of the electric field at position P, being 10 cm from the centre of the...
43. ### Potential inside grounded, conducting sphere with dipole at center.

Homework Statement Suppose a grounded spherical conducting shell of radius R surrounds a pointlike dipole at the center with \vec{p}=p\vec{k} Find the potential V(r,\theta) for r <= R. Hint: Use spherical harmonics regular at r=0 to satisfy the boundary condition. Homework Equations General...
44. ### Electric Potential due to conducting sphere and conducting shell

Homework Statement A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential difference between the surface of the solid sphere and that of the outer surface of the hollow shell be V. If the shell is now given a...
45. ### Multipole approximation outside conducting sphere

Homework Statement A dipole is placed next to a sphere (see image), at a large distance what is E proportional to? 3. The Attempt at a Solution or lack thereof I'm having trouble figuring out what's happening in any variations of these. How does the dipole affect the sphere's charge...
46. ### Point charge and conducting sphere

Homework Statement Q a) A charge is placed at a distance x from the center of a conducting sphere of radius R.Find the charge flown through the switch(from ground) when it is closed . b) In the above question replace the switch with an ammeter .What is the reading of ammeter if charge is...
47. ### Why is the electric field inside of a conducting sphere zero?

Homework Statement Consider a solid conducting sphere with a radius a and charge Q1 on it. There is a conducting spherical shell concentric to the sphere. The shell has an inner radius b > a, outer radius c and a net charge Q2 on the shell. Denote the charge on the inner surface of the shell...
48. ### Image Charges and a hollow conducting sphere

Homework Statement Hi! Bear in mind, before shooting me down, that I'm very new to electrostatics and extremely (i.e. today) new to the method of image charges, and all my learning is dodgy book-learning and not learning from asking the learned questions. This said, I just want my...
49. ### Method of Image grounded conducting sphere.

Homework Statement A point charge of 10 coulombs is placed at a distance d= 20cm from the centre of an earthed conducting sphere of radius a= 5cm.Find ① The maximum surface density of charge induced on the sphere. ② The force of attraction on the point charge ③ The Sphere is now Insulated...
50. ### Point Charge in the presence of charged, insulated, conducting sphere

So here we are talking about solving this problem by method of images. The approach taken by most of electrodynamics textbooks is as follows: "If we wish to consider the problem of an insulated conducting sphere with total charge Q in the presence of a point charge q, we can build up the...