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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.c. source. How does the brightness of the bulb change when iron core is removed from the solenoid ?

Text Solution

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The brightness of bulb remains unchanged because the solenoid does not offer any reactance `(X_(L) = 2 pi v L)` to d.c. source `(v = 0)`.
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