For the given field lines for a positive and a negative point charge respectively, which of the following is correct?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → $(V_P-V_Q)$ is positive and work done by the external agency in moving a small negative charge from B to A is positive.
In picture (a),
$V_P-V_Q$ is positive, as potential at point P is greater due to repulsive force.
In picture (b),
Yes, work done by the external agency in moving a small negative charge form B to A is positive as at B, the repulsive force will be much greater.