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Q.

In the circuit shown in figure, an ideal ammeter and an ideal voltmeter are used. When the key is open, the voltmeter reads 1.53 V. When the key is closed, he ammeter reads 1.0 A and the voltmeter reads 1.03 V. the resistance R is 

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a

0.53  Ω

b

1.53  Ω

c

1.03  Ω

d

0.5  Ω

answer is B.

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Detailed Solution

A careful analysis would show that the voltage along R is 1.03 V, So

1.03=1×R   or   R=1.03  Ω

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