Current Electricity

Related Questions

• A potential difference of V is applied at the ends of a copper wire of length l and diameter d. On doubling only d, drift velocity

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• The current in the given circuit is

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• A galvanometer of 50 ohm resistance has 25 divisions. A current of $4 \times 10^{–4}$ ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of

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• A battery of e.m.f. 10 V and internal resistance 0.5 ohm is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by

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• A $5^\circ C$ rise in temperature is observed in a conductor by passing a current. When the current is doubled the rise in temperature will be approximately

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