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Question

A milliammeter of range 10 mA and resistance 9 Ω is joined in a circuit as shown. The meter gives full scale deflection for current I when A and B are used as its terminals. i.e., current enters at A and leaves at B (C is left isolated). The value of I is


A
100 mA
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B
900 mA
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C
1 A
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D
1.1 A
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Solution

The correct option is C 1 A
In parallel, current distributes in inverse ratio of resistance.
0.01I0.01=0.19+0.9

Solving we get I=1 A
Hence, the correct answer is (C).

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