Pease help A charge Q = - 832 nC is uniformly distributed on a ring of 2.2 m rad

Question

Pease help

A charge Q = - 832 nC is uniformly distributed on a ring of 2.2 m radius. A charge q=+483 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 = - 832 nC is uniformly distributed on a ring of 2.2 m radius. A charge q=+483 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:

Explanation / Answer

potential at A = potential due to ring + potential due to charge at centre

= -2634.27 V + 2415

=-219.27

potential at A = potential due to ring + potential due to charge at centre

= -1928.258 V + 1358.4375

=-569.8205

Work done by external force = q* (Vb-Va)

=-350eV

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