The brightness of a bulb will be reduced, if a resistance is connected in
A
Series with it
B
Parallel with it
C
Series or parallel with it
D
Brightness of the bulb cannot be reduced
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A
Series with it
a (a)When resistance is connected in series, brightness of bulb decreases because voltage across the bulb decreases.
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Four identical cells each having an electromotive force $(e.m.f.)$ of $12\,V$, are connected in parallel. The resultant electromotive force $(e.m.f.)$ of the combination is .............. $V$
$A$ wire of length $L$ and $3$ identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire is raised by $\Delta T$ in time $t. N$ number of similar cells is now connected in series with a wire of the same material and cross section but of length $2L$. The temperature of the wire is raised by the same amount $\Delta T$ in the same time $t$. The value of $N$ is :