Current Electricity

Related Questions

• A potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)

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• If an ammeter is to be used in place of a voltmeter then we must connect with the ammeter a

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• A wire of radius r has resistance R. If it is stretched to a radius of $\frac{3r}{4}$, its resistance becomes

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• The effective resistance between points A and B is

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• In a potentiometer circuit there is a cell of e.m.f.2 volt, a resistance of 5 ohm and a wire of uniform thickness of length 1000 cm and resistance 15 ohm. The potential gradient in the wire is

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