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Q.

A milliameter of range 10 mA and resistance 9Ω 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

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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

Ammeter and 0.9 Ω is in series10×10−3(9.9)=i×0.1=i=0.99So current = 0.99 + 0.01 = 1 Amp.
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