Q.
In the following diagram the work done in moving a point charge from point P to point A, B and C is respectively as $W_{A},\ W_{B}and\ W_{C}$ then
A) $W_{A} = W_{B} = W_{C}$
B) $W_{A} = W_{B} = W_{C} = 0$
C) $W_{A} > W_{B} > W_{C}$
D) $W_{A} < W_{B} < W_{C}$
Explanation
(a) When a positive charge is moved from one point to another in an electric of magnetic field, then under the influence of the field force acts on the particle and an external agent will have to do work against this force. But in the given case the charge moves under influence of no field, hence it does not experience any force therefore, no work is done.
$W_{A} = W_{B} = W_{C} = 0$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.