Electromagnetic Field Theory
The energy stored in the magnetic field in a solenoid 10 cm long and 4 cm diameter wound with 2000 turns of wire carrying a current at 20 amp, is

 24 joules.
 30 joules.
 15 joules.
 12 joules.

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Electromagnetic Field Theory
The effective reactance of an inductive coil

 remains same irrespective of the frequency.
 none of these.
 decreases because of stray capacitance as the frequency increases.
 increases because of stray capacitance as the frequency increases.

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