A bulb and a solenoid connected in a series in dc supply if a iron core is inserted in the solenoid what happen to the brightness of bulb
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as iron is inserted, the magnetic field inside of the coil increases. hence, the inductive reactance increases.

for inductor, I is equal to

from these relation I is inversely proportional to L.
therefore, current decreases as increase in L and hence brightness of bulb decreases.

for inductor, I is equal to

from these relation I is inversely proportional to L.
therefore, current decreases as increase in L and hence brightness of bulb decreases.
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