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Q.

A milli-ammeter of range 10 mA and resistance 9  Ω are joined in a circuit as shown in the figure. The meter gives full scale deflection, when current in the main circuit is I, and A and D are used as terminals. The value of I is 

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a

1.09 A

b

10.9 A

c

 zero

d

0.109 A

answer is D.

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Detailed Solution

(0.1+0.3+0.6)i1=(9+0.9)×10

i=99  mA

I=(99+10)mA=0.109  A

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A milli-ammeter of range 10 mA and resistance 9  Ω are joined in a circuit as shown in the figure. The meter gives full scale deflection, when current in the main circuit is I, and A and D are used as terminals. The value of I is