In figure the switch has been in position 1 for a long time. At t = 0, the switch is moved to position 2. The equation for transient current is

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Question: In figure the switch has been in position 1 for a long time. At t = 0, the switch is moved to position 2. The equation for transient current is
[A].

[B].

[C].

[D].

Answer: Option C

Explanation:

When switch is in position 2, time constant is