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Earn 100
The potential difference between points and of adjoining figure is
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Important Questions on Current Electricity
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A conductor carries a current of . The number of electrons passing through it in minute are ___ .
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The current flowing through a wire depends on time as The charge flowing through the cross section of the wire in time from to is
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The unit of current element is
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is the SI unit of
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A voltmeter having a resistance of is used to measure the potential difference across a resistor which is connected to a battery of emf and internal resistance The percentage of decrease in the potential difference across the resistor when the voltmeter is connected across it is
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Identify the correct variation of drift velocity with electric field strength
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Assertion (A): As soon as a source of emf is connected across a conductor, a current immediately starts flowing through it.
Reason (R): Drift speed of the electron is so large that electron travel from one end of the conductor to the other end almost instantaneously.
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An electric cable has just one copper wire of radius and resistance . This single copper wire cable is replaced by different well insulated copper wires each of radius then total resistance of the cable is
