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A solenoid with an iron core and a bulb are connected to a d.c. source. How does the brightness of the bulb change,

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

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On removing the iron core from the solenoid, the magnetic flux linked with the coil decreases and induced e.m.f. is produced, hence the brightness of the bulb will increase.

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