Current Electricity

Related Questions

• A piece of wire of resistance 4 ohms is bent through $180^\circ$ at its mid point and the two halves are twisted together, then the resistance is

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• There is a current of 40 ampere in a wire of $10^{-6}m^2$ area of cross-section. If the number of free electron per $m^3$ is $10^{29}$, then the drift velocity will be

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• A 100 V voltmeter of internal resistance $20\,k\Omega $ in series with a high resistance R is connected to a 110 V line. The voltmeter reads 5 V, the value of R is

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• The alloys constantan and manganin are used to make standard resistance due to they have

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