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 -451. Please explain how to do this problem.

Explanation / Answer

Va = Vring + Vq

VA = KQx/sqrt(x^2 +r^2) + Kq/x = -874

VB = Vring +Vq

VB = KQx/sqrt(x^2 +r^2) + Kq/x= 605

Work done by an external force that transports an electron from B to A = DU

=final potential energy - initial potential energy= e(Va-Vb)

= 1.6*10^-19 * 269.17

= -431 eV

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