ElectroMagnetic InductionMedium
Question
A coil of copper wire is connected in series with a bulb, a battery and a switch. When the circuit is completed the bulb lights up immediately. The circuit is switched off and a rod of soft iron is placed inside the coil. On completing the circuit again. It is observed that :-
Options
A.Bulb is not so bright
B.There is a slight deley before bulb lights to its normal brightness
C.The bulb is initially bright but gradually becomes dim
D.The bulb is brighter than before
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