1 Kilojoule [kJ] = 737.562 149 277 27 Foot pound force [ftlbf]
Explanation:
It is given that,
Let Charge of
is taken from points A & B such that
.
We need to find the energy of charge. Electric potential is defined as the work done per unit of electric charge. So,

So, the energy of charge decreases by
. Hence, the correct option is (a).
While he is lifting the dumbell as the definition of work done = moving a mass through a distance = F x d