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The switch in the circuit in the figure is in position $P$ for a long time and then moved to position $Q$ at time $t=0$.

The value of $\dfrac{dv\left ( t \right )}{dt}$ at $t=0^{+}$ is

1. $0\:V/s$
2. $3\:V/s$
3. $-3\:V/s$
4. $-5\:V/s$