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Important Questions on Current Electricity
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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
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In the circuit shown below, the current is __________
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and are two points on a uniform ring of resistance The angle . The equivalent resistance between and is
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If the balancing length in a potentiometer experiment changes by when the cell of unknown emf is shunted by resistance, then the internal resistance of the cell in is
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Two galvanometers and require and respectively to produce same deflection of divisions. Then.
