An inductor having self inductance L and resistance R is connected across a battery of emf $ε$ . When the current is in steady state, at t = 0 an iron rod is inserted into the inductor. Then after insertion of the rod, current in the circuit

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remains constant with time

first decreases with time then becomes constant

increases with time

decreases with time

answer is D.

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Detailed Solution

When the iron rod is inserted, inductance of coil is changed abruptly, flux in it remains same i.e. $ϕ = L i =$ constant, so current will decrease. Now current will increase with time to attain the steady value $\frac{ε}{R}$ .

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