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The time taken for the magnetic energy to reach \(25 \%\) of its maximum value, when a solenoid of resistance \(R\) and …

Q1

The time taken for the magnetic energy to reach \(25 \%\) of its maximum value, when a solenoid of resistance \(R\) and inductance \(L\) is connected to a battery, is:

a

\(\frac{\mathrm{L}}{\mathrm{R}}(\ln 2)\)

b

\(\frac{\mathrm{L}}{\mathrm{R}}(\ln 10)\)

c

\(\mathrm{Infinite}\)

d

\(\frac{\mathrm{L}}{\mathrm{R}}(\ln 5)\)

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