Q.

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
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