Figures 2.8 (a) and (b) show the field lines of a positive and negative point charge respectively.

(a) Give the signs of the potential difference `V_(P)-V_(Q): V_(B)-V_(A)`.
(b) Give the sign of the potential energy difference of a small negative charge between the points Q and P, A and B.
(c) Give the sign of the work done by the field in moving a small positive charge from Q to P.
(d) Give the sign of the work done by the external agency in moving a small negative charge from B to A.
(e) Does the kinetic energy of a small negative charge increase or decrease in going from B to A?

Explanation

`V_(B) -V_(A)` negative (b) `U_(Q)-U_(P) lt 0` and `U_(A) - U_(B) lt 0` (c) Work done positive (d) Work done negative (e) Velocity increases thus kinetic energy also increases )