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The resistance of an incandescent lamp i...

The resistance of an incandescent lamp is

A

smaller when switched on

B

greater when switched off

C

the same whether it is switch off or switch on

D

greater when switched on.

Text Solution

Verified by Experts

The correct Answer is:
D
The resistance of an incandescent lamp is greater when switched on because of the fact that the resistance increases with temperature. When the switch is on, temperature of the incandescent lamp will increase due to Joule.s heating effect `(i^(2)Rt)`.
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