A candidate connects a moving coil voltmeter `V`, a moving coil ammeter `A` and a resistance `R` as shown in figure. If the voltmeter reads `24 V` and the ammeter reads `4 A`, R is

Options

A. equal to `5 Omega`
B. greater than `5 Omega`
C. `less than `5 Omega`
D. greater or less than `5 Omega` depending upon its material

Answer

B

Explanation

Let a current of `x` ampere pass through the voltmeter, then
`(4 - x)` ampere passes through the resistance `R`. Therefore, voltmeter reading is
`20 = (4 -x) R`, i.e., `R = (20)/(4 - x)`, i.e., `R gt 5 Omega`