A cardidate 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

(b) Let a current of `x` ampere passes through the voltmeter, then `(4 - x)` ampere passes through the resistance `R`.
Therefore, voltmeter reading `20 = (40 - x) R`
`:. R = (20)/(4 - x)`, i.e.,`R gt 5 Omega`