Question

Calculate the amount of work done in shifting a charge of 2 coulombs from a point A to B having potential 10 V and 5 V respectively.

Answer 1

Work done in moving a charge of 2 C from a place where potential difference is 10 volts to another place where potential difference is - 5 volts.
q = 2 C
Va = 10 volts
Vb = -5 volts
As, Wab = q (Vb - Va) = 2 (-5 -10) = -30 J