The current in a conductor and the potential difference across its ends are measured by an ammet...

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The current in a conductor and the potential difference across its ends are measured by an ammeter and a
\( \mathrm{P} \) voltmeter. The meters draw negligible currents. The

W. ammeter is accurate but the voltmeter has a zero error (that is, it does not read zero when no potential difference is applied). Calculate the zero error if the readings for two different conditions are \( 1.75 \mathrm{~A}, 14.4 \mathrm{~V} \) and \( 2 \cdot 75 \mathrm{~A}, 22 \cdot 4 \mathrm{~V} \).
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