A solenoid with self-inductance L =2 H and carrying a steady current of 1 A has the

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A solenoid with self-inductance L =2 H and carrying a steady current of 1 A has the current source suddenly disconnected. What is the minimum capacitance which should be connected across the terminals of the solenoid in order to prevent the potential difference generated by the collapse of the magnetic field from rising above 300 V?

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