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 20 Y and the ammeter reads 4 A, R is
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a
equal to 5 Ω
b
greater than 5 Ω
c
less than 5 Ω
d
greater or less than 5 Ω depending upon its material
answer is B.
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Detailed Solution
Let a current of x amperes passes through the voltmeter, then 4−x amperes passes through the resistance R. Therefore, voltmeter reading 20 = 4−x R∴ R=204−x , i.e., R > 5 Ω