A charge Q = - 801 nC is uniformly distributed on a ring of 2.4 m radius. A char

Question

A charge Q = - 801 nC is uniformly distributed on a ring of 2.4 m radius. A charge q=+481 nC is placed at the center of the ring. Points A and B are located on the axis of the ring, as shown. In Figure, the work in eV (as a whole number) done by an external force that transports an electron from B to A is:

A charge Q = - 801 nC is uniformly distributed on a ring of 2.4 m radius. A charge q=+481 nC is placed at the center of the ring. Points A and B are located on the axis of the ring, as shown. In Figure, the work in eV (as a whole number) done by an external force that transports an electron from B to A is: The correct answer is -451Please explain how to do this problem.

Explanation / Answer

The attempt at a solution
1/2 mv^2=ke*q1q2/r12+ke*Q*qe/sqrt(x^2+a^2)

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