Electro Magnetic Induction And Alternating Currents Question 162

Question: A coil of inductance 8.4 mH and resistance 6Ω is connected to a 12 V battery. The current in the coil is 1.0 A at approximately the time

Options:

A) 500s

B) 25s

C) 35ms

D) 1ms

Show Answer

Answer:

Correct Answer: D

Solution:

  • Using I=I0(1−e−t/τ)

    But I0=VR

    and τ=LR
    ∴I=VR(1−e−Rt/L)=126[1−e−6t/8.4×10−3] =1 (given)
    ∴t=0.97×10−3s≈1ms

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