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Inductors - Engineering

Q1:

Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?

A 219 k

B 66 k

C 660 k

D 1.3 M

ANS:C - 660 k

Total inductance=1/(1/10+1/10) +5 =15 H.

Now, total inductive reactance = 2*3.14*f*L = 2*3.14*15*7000 = 660000 ohm (APPROX).