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  • ,A candidate connects a moving coil voltmeter V, a moving coil ammeter A and a resisot R as shown in Figure. If the voltmeter reads 20 V and the ammeter reads 4 A, R is <img alt="" src=

,A candidate connects a moving coil voltmeter V, a moving coil ammeter A and a resisot R as shown in Figure. If the voltmeter reads 20 V and the ammeter reads 4 A, R is

Option: 1

 Equal to 5 \Omega
 


Option: 2

 Greater than 5 \Omega
 


Option: 3

Less than 5\Omega


Option: 4

 Greater or less than 5 \Omega depending upon its material


Answers (1)

best_answer

Let a current of x ampere pass through the voltmeter; then (4-x) ampere passes through the resistance R
Therefore, voltmeter reading is

\mathrm{20=(4-x) R \text {, i.e., } R=\frac{20}{4-x^{\prime}} \text { i.e., } R>5 \Omega }

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shivangi.bhatnagar

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