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Q.

A coil is connected to a battery of 12V emf and negligible internal resistance. The current in the solenoid grows to 63% of its final steady state value in 0.3s. If the final steady state current is 0.6A, the inductance of the solenoid is ( $l$ n 0.37 =0.994)

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a

$0.6 H$

b

$6.0 H$

c

$0.015 H$

d

$0.15 H$

answer is B.

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Detailed Solution

$τ = \frac{L}{R} = \frac{L i}{V}$

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A coil is connected to a battery of 12V emf and negligible internal resistance. The current in the solenoid grows to 63% of its final steady state value in 0.3s. If the final steady state current is 0.6A, the inductance of the solenoid is ( l n 0.37 =0.994)