The work done by the field of a nucleus in a complete circular orbit of the electron is
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) - Zero
The nucleus exerts an electrostatic force on the orbiting electron. This force acts as the centripetal force and always point towards the centre of circular orbit -
$W=\vec F.\vec d=Fd\cos θ$
for a circular orbit, the force is always perpendicular to the instantaneous displacement of electron.
$θ=90°$