Question: How many time constants does it take for the potential difference across the resistor in an LR circuit like that in Fig. 21-37 to drop

How many time constants does it take for the potential difference across the resistor in an LR circuit like that in Fig. 21-37 to drop to 2.5% of its original value, after the switch is moved to the upper position, removing from V0 the circuit?

A B Vo Switch

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