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Define one ampere.
The resistance of a wire of 0·01 cm radius is 14 Ω. If the resistivity of the material of the wire is 44 × 10⁻⁸ Ωm, find the length of the wire. (Given π = 22/7)
Assertion (A) : Electrons move from lower potential to higher potential in a conductor. Reason (R) : A dry cell maintains electric potential difference across the ends of a conductor.
The filament of an electric lamp draws a current of 0·5 A, which lights for 2 hours. Calculate the charge that flows through the circuit.
An electric source can supply a charge of 750 coulomb. If the current drawn by a device is 15 mA, find the time in which the electric source will be discharged completely.
An electric source can supply a charge of 500 coulomb. If the current drawn by a device is 25 mA, find the time in which the electric source will be discharged completely.
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