Fig (a) and (b) show the field lines of a single positive and negative charges respectively .
Does the kinetic energy of a small negative charge increase or decrease in going from B to A ?

Explanation

We have seen in part (b) of the question that there is a gain in potential energy of a small -ve charge in going from B to A . Gain in potential energy means loss of kinetic energy . It means that K.E. of a small -ve charge decreases in going from B to A .