Current Electricity

Related Questions

• The resistance of a 5 cm long wire is 10 ohm. It is uniformly stretched so that its length becomes 20 cm. The resistance of the wire is

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• The resistivity of alloys $ = {R_{{\rm{alloy}}}}$; the resistivity of constituent metals $R_{\mathrm{metal}}$. Then, usually

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• Two rods of same material and length have their electric resistance in ratio 1:2. When both rods are dipped in water, the correct statement will be

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• The electric field E, current density J and conductivity ? of a conductor are related as

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• $A\,\,{5^o}C$ rise in the temperature is observed in a conductor by passing some current. When the current is doubled, then rise in temperature will be equal to

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