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Q.

A galvanometer coil has a resistance 90  Ω and full scale deflection current 10 mA. A 910  Ω resistance is connected in series with the galvanometer to make a voltmeter. If the least count of the voltmeter is 0.1 V the number of divisions on its scale is

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a

90

b

91

c

100

d

None

answer is C.

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Detailed Solution

RV =Vig −G ⇒  910  =  V10 ×  10−3−90⇒  V=10⇒ No.  of  division=100.1=100
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A galvanometer coil has a resistance 90  Ω and full scale deflection current 10 mA. A 910  Ω resistance is connected in series with the galvanometer to make a voltmeter. If the least count of the voltmeter is 0.1 V the number of divisions on its scale is