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Q.

The time constant of an inductance coil is 2.0×10−3s . When a 90Ω resistance is joined in series, then the time constant becomes 0.5×10−3s. The inductance and resistance of the coil are

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a

60mH,60Ω

b

60mH,30Ω

c

30mH,30Ω

d

30mH,60Ω

answer is C.

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Detailed Solution

Time constant, τ=LR=2.0×10−3s  and LR+90=0.5×10−3s
Solving these two equations, we get L=60mH  and  R=30Ω  

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