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The resistance of a coil is measured by the ammeter–voltmeter method. With the voltmeter connected across...

The resistance of a coil is measured by the ammeter–voltmeter method. With the voltmeter connected across the coil, the readings on the ammeter and voltmeter are 0.4 A and 3.2 V respectively. The resistance of the voltmeter is 500 Ω. Calculate: (a) the true value of the resistance; (b) the percentage error in the value of the resistance if the voltmeter current were neglected.
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