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

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a

100 mA

b

900 mA

c

1 A

d

1.1 A

answer is C.

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Detailed Solution

ig=10mA = 0.01 A VA− VB= I − ig 0.1 = ig9 + 0.9I=10×0.010.1=1A

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