A nonconducting sphere of radius R has a total charge Q spread uniformly through

Question

A nonconducting sphere of radius R has a total charge Q spread uniformly throughout its volume. What is the potential energy of the sphere? (k = 1/4 pi epsilon_0) (A) kQ^2/R (B) kQ^2/2R (C) 2kQ^2/3R (D)2kQ^2/5R (E)3kQ^2/5R A particle of mass m and charge q is in a circular orbit of radius R normal to an external magnetic field B. The magnetic field, at the center of its orbit, created by the charge is _____. (A) mu_0/4 pi qB/mR (B) mu_0/4 pi q^2B/mR (C) mu_0/4 pi mR/qB (D) mu_0/4 pi mR/q^2B (E) mu_0/4 pi qB^2/mR

Explanation / Answer

1) Potential energy = QV

so, Option A is correct

2) The question is asked to find the magnetic field but in each answer there is term of magnetic field. how is it possible?

All options are wrong.

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