A student connects a long air cored coil of magnanin wire to 100v d.c.supply and records a current of 25ampere.when the same coil is connected across 100v.50hz a.c.the current reduces to 20 ampere,the reactance of coil is

A student connects a long air cored coil of magnanin wire to 100v d.c.

1.	A student connects a long air cored coil of magnanin wire to 100v d.c.supply and records a current of 25ampere.when the same coil is connected across 100v.50hz a.c.the current reduces to 20 ampere,the reactance of coil is
Answer» : 3 ohmExplanation: For DC CIRCUIT:R= 100÷25 = 4 ohmFor AC circuit:Z = V÷I = 100÷20 = 5 ohmZ=√(R^2 + Xl^2)25=16 + Xl^2Xl= 3 .

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A student connects a long air cored coil of magnanin wire to 100v d.c.supply and records a current of 25ampere.when the same coil is connected across 100v.50hz a.c.the current reduces to 20 ampere,the reactance of coil is

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