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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 $\dfrac{d^{2}i}{dt^{2}}$ at $t=0^{+}$ is

  1. $\dfrac{V}{L} \\$
  2. $\dfrac{-V}{R} \\$
  3. $0 \\$
  4. $\dfrac{-RV}{L^{2}}$
in Electric Circuits edited by
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