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A coil of copper wire is connected in series with a bulb a battery and...

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Physics

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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 1 Bulb is not so bright 2 There is a slight delay before bulb lights to its normal brightness 3 The bulb is initially bright but gradually becomes dim 4 The bulb is brighter than before

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