At t = 0 , the plates of a capacitor of capacitance 10 ext ,...

The charge on a discharging capacitor at any time $t$ is given by the equation $q(t) = q_0 e^{-t/RC}$.

Given the initial charge on the capacitor is $q_0 = 60 \mu\text{C}$.

Substituting $t = 0$ in the equation, we get:

$q(0) = 60 \times e^0 = 60 \mu\text{C}$

Thus, the charge on the capacitor at the instant the connection is made ($t = 0$) remains equal to its initial charge, which is $60 \mu\text{C}$.