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A solenoid has an inductance of 10 henty...

A solenoid has an inductance of 10 henty and a resistance of 2 ohm. It is connected to a 10 volt battery. How long will it take for the magnetic energy to reach `1//4` of its maximum value?

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The correct Answer is:
`t=(L//R) l""n 2=3.47 s `
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