Question: In an RC circuit, the time constant is defined as: What happens to the current in an RL circuit immediately after the switch is closed

In an RC circuit, the time constant is defined as:
What happens to the current in an RL circuit immediately after the switch is closed at t=0?
The current instantly reaches its maximum value.
The current decreases exponentially to zero.
The current is zero and remains constant.
The current increases exponentially to its steady-state value.
In an RC circuit, the time constant is defined

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