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Alternating Current question

2022 · 29 Jul · Shift 1 · Q61
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Alternating Current question

2022 · 29 Jul · Shift 1 · Q61

JEE MainPhysicsAlternating CurrentMCQ+4 / −1
A coil of inductance 1 H and resistance 100 Ω100 \,\Omega100Ω is connected to a battery of 6 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 ms after the circuit is switched on. (Given ln⁡2=0.693,e−3/2=0.25\ln 2=0.693, \mathrm{e}^{-3 / 2}=0.25ln2=0.693,e−3/2=0.25)
  1. A
    t = 10 ms; U = 2 mJ
  2. B
    t = 10 ms; U = 1 mJ
  3. C
    t = 7 ms; U = 1 mJ
  4. D
    t = 7 ms; U = 2 mJ
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