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In given figure $1.2,$ the switch was closed for a long time before opening at $t=0$. The voltage $V x$ at $t=0^{+}$ is

  1. $25 \mathrm{~V}$
  2. $50 \mathrm{~V}$
  3. $-50 \mathrm{~V}$
  4. $0 \mathrm{~V}$
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