The work done can be calculated using the formula:
W = Q * V
where W is the work done in joules (J), Q is the charge in coulombs (C), and V is the voltage in volts (V).
In this case, Q = 2.53 nC = 2.53 x 10^-9 C and V = 65 V.
Substituting these values into the formula, we get:
W = 2.53 x 10^-9 C * 65 V
W = 1.64 x 10^-7 J
Therefore, the work done is 1.64 x 10^-7 joules (J).