Assignment:
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 0.4A and 3.2 V respectively. The resistance of the voltmeter is 500 Ohm. Calculate (a) the true value of the resistance and (b) the percentage error in the value of the resistance, if the voltmeter current were neglected.
Provide complete and step by step solution for the question, use formulas.