Current Electricity

Related Questions

• An electric wire of length ‘I’ and area of cross-section $a$ has a resistance R ohm. Another wire of the same material having same length and area of cross-section 4a has a resistance of

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• The current flowing in a coil of resistance 90 $\Omega$ is to be reduced by 90%. What value of resistance should be connected in parallel with it

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• There are three voltmeters of the same range but of resistances $10000\,\Omega $, $8000\,\Omega $ and $4000\,\Omega $ respectively. The best voltmeter among these is the one whose resistance is

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• n equal resistors are first connected in series and then connected in parallel. What is the ratio of the maximum to the minimum resistance

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• In the circuit shown, the point ‘B’ is earthed. The potential at the point ‘A’ is

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