A candidate connects a moving coil ammeter $A$ and a moving coil voltmeter $V$ and a resistance $R$ as shown in figure

If the voltmeter reads $20 V$ and the ammeter reads $4 A, t h e n R$ is

Question

A candidate connects a moving coil ammeter A and a moving coil voltmeter V and a resistance R as shown in figure If the voltmeter reads 20 V and the ammeter reads 4 A , t h e n R is

TestHub · Accepted Answer

Here, i = 4 A ; V = 20 Volt; so, R = V I = 20 4 = 5 Ω . Since, voltmeter is connected in parallel with resistance R , the effective resistance of this combination is 5 Ω only if the resistance R is greater than 5 Ω , since total resistance in parallel combination becomes less than individual resistance.

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