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A piece of wire of resistance $R$ is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is $R'$, then the ratio $\frac{R}{R'}$ is –
$\frac{1}{25}$
2.$\frac{1}{5}$
3.5
4.25
Which of the following terms does not represent electrical power in a circuit?
$I^2R$
2.$IR^2$
3.$VI$
4.$\frac{V^2}{R}$
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be –
100 W
2.75 W
3.50 W
4.25 W
Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be –
1:2
2.2:1
3.1:4
4.4:1
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