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A series $RL$ circuit is excited at $t = 0$ by closing a switch as shown in the figure. Assuming zero initial conditions, the value of $\frac{d^{2}i}{dt^{2}}$ at $t=0^{+}$ is

  1. $\frac{V}{L}$
  2. $\frac{-V}{R}$
  3. $0$
  4. $\frac{-RV}{L^{2}}$
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