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Q.

A galvanometer of coil resistance 100Ω  is connected to a shunt of resistance 10Ω .The current through the galvanometer is i1and the current through the shunt is i2.Then the ratio i1:i2 is 

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a

1:10

b

10: 1

c

11: 10

d

10: 11    

answer is A.

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Detailed Solution

S=10Ω,   G=100Ω,

   igi=SS+G  igi=10110=111ig=i11

  isi=GS+G  isi=100110=1011ig=10i11    ,      i1:i2=i11:10i11=111:1011=1:10

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