Find out potential at `P` and `Q` due to the two point mass system Find out work done by external agent in bringing unit mass from `P` to `Q` Also find work done by gravitational force.
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In previous problem, find the work done by external agent.

Find the work done by the Lorentz force.

Q Find out P and Q :

Find the potential V at P in the gravitational field of fixed point mass M .

Find the potential V at P in the gravitational field of fixed point mass M .

Statement-1: Gravitational potential is zero inside a shell. Statement-2: Gravitational potential is equal to the work done in bringing a unit mass from infinity to a point inside gravitational field.

_______at a point is the amount of work done in bringing a body of unit mass from infinity to that point.