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A solenoid with an iron core and a bulb ...

A solenoid with an iron core and a bulb are connected to a d.e. source. How does the brightness of the bulb change, when the iron core is removed from the solenoid ?

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The brightness of the bulb does not change because there is no effect of inductance of the solenoid in a d.c. circuit
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U-LIKE SERIES-ELECTROMAGNETICE INDUCTION-Very Short Answer Questions
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  16. Define mutual inductance of a pair of coils and write its SI unit.

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