Current Electricity

Related Questions

• A galvanometer can be used as a voltmeter by connecting a

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• ${10^{ - 3}}amp$ is flowing through a resistance of $1000\,\Omega $. To measure the correct potential difference, the voltmeter is to be used of which the resistance should be

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• The ammeter A reads 2 A and the voltmeter V reads 20 V. the value of resistance R is (Assuming finite resistance's of ammeter and voltmeter)

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• Equal potentials are applied on an iron and copper wire of same length. In order to have the same current flow in the two wires, the ratio r (iron)/r (copper) of their radii must be (Given that specific resistance of iron = $1.0\times10^{-7}ohm–m$ and specific resistance of copper = $1.7\times10^{-8}ohm-m$)

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• An electron (charge = $1.6 \times 10^{–19}$ coulomb) is moving in a circle of radius $5.1 \times 10^{–11} m$ at a frequency of $6.8 \times 10^{15}$ revolutions/sec. The equivalent current is approximately

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