Current Electricity

Related Questions

• A certain wire has a resistance $R$. The resistance of another wire identical with the first except having twice its diameter is

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• A uniform wire of resistance $R$ is uniformly compressed along its length, until its radius becomes n times the original radius. Now resistance of the wire becomes

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• The potential gradient along the length of a uniform wire is $10\,volt/metre$. $B$ and $C$ are the two points at $30\,cm$ and $60\,cm$ point on a meter scale fitted along the wire. The potential difference between $B$ and $C$ will be

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• An ammeter and a voltmeter of resistance R are connected in series to an electric cell of negligible internal resistance. Their readings are A and V respectively. If another resistance R is connected in parallel with the voltmeter

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• The circuit shown here is used to compare the e.m.f. of two cells ${E_1}$ and ${E_2}({E_1} > {E_2})$. The null point is at C when the galvanometer is connected to ${E_1}$. When the galvanometer is connected to ${E_2}$, the null point will be

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