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
Correct Answer: D
Solution :
\[R\propto \frac{1}{t}\] t = average time interval between two successive collision of electrons. When switched on, temperature of filament increases, there by K.E. of \[\overline{c}\]increases which increases the velocity of electron Hence, time interval (t) between two collision decreases, hence R increases.
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