Electro Magnetic Induction And Alternating Currents Question 608

Question: A coil of inductance 300 mH and resistance 2Ω is connected to a source of voltage 2V . The current reaches half of its steady state value in [AIEEE 2005]

Options:

A) 0.15 s

B) 0.3 s

C) 0.05 s

D) 0.1 s

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Answer:

Correct Answer: D

Solution:

i=i0(1eRtL)

Þ For i=i02 , t=0.693LR

Þ t=0.693×300×1032=0.1,sec



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