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The potential gradient of the wire of potentiometer is 0.3 V/m. In the calibration of ammeter, potential difference

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The potential gradient of the wire of potentiometer is 0.3 V/m. In the calibration of ammeter, potential difference across 1 Ω coil is balanced at 1.5 m length. If the reading of ammeter is 0.28A then find out the error in the reading of ammeter.

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Virtual current is measured by Ammeter I = 0.28 A

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