A solenoid of inductance 250 mH and resistance 10 Ω is connected to a battery. The time taken for the magnetic energy to reach 1/4th of its maximum value is
1
loge(2)
2
10-3 loge(2)
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25 loge(2)
4
\(\frac{1}{40} \log _{\mathrm{e}}(2)\)
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