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a boy makes a long air core oil of managin and connects it across 100v D.C source. a current if 1a flows ina circuit. when the same coil is connected across 100 A.C source, the current in the circuit reduces to 0.6A, explain the reason for decrease in current.
Remember the Lenz's law:Whenever current(or flux) linked with a circuit changes,the circuit opposes the change by generating a back current(or back emf).That is why in the second case a current is generated in the opposite direction to the ac current applied.It reduces the current in the circuit from 1 amp to some amount (1-Iinduced)=0.6A.Hope this helps
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