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Growth of current in an LR circuit after the switch is closed

This type of question, asked 2 times: 29 Jul 2022, 6 Apr 2026 S1. All 2 questions below, oldest first.

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  1. Question 1

    29 Jul 2022

    14
    A coil of inductance 1H1H and resistance 100Ω100\Omega is connected to a battery of 6 V6\text{ }V. Determine approximately: (A) The time elapsed before the current acquires half of its steady - state value (B) The energy stored in the magnetic field associated with the coil at an instant 15 ms15\text{ }ms after the circuit is switched on. (Given ln⁡2=0.693\ln 2 = 0.693, e−3/2=0.25e^{- 3/2}= 0.25 )

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  2. Question 2

    6 Apr 2026 S1

    18
    An inductor of inductance 10mH having resistance of 100Ω100\Omega is connected to battery of E.M.F. 1.0 V through a switch as shown in the figure below. After switch is closed, the ratio of instantaneous voltages across the inductor when the current passing through it is 2 mA and 4 mA is ____\_\_\_\_ .

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