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, Equal to 5 Ω, Greater than 5 Ω, Less than 5 Ω, Greater or less than 5 Ω depending upon its material

MARKS App · 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.

Search any question & find its solution

Looking for more such questions to practice?