Question
The scale of a galvanometer of resistance 100Ω contains 25 divisions. It gives a deflection of one division on passing a current of 4×10−4 A. The resistance in ohms to be added to it, so that it may become a voltmeter of range 2.5 volt is
Answer: Option B
:
B
Current sensitivity of galvanometer =4×10−4 Amp/div.
So full scale deflection current (ig)=Currentsensitivity×Totalnumberofdivision=4×10−4×25=10−2A
To convert galvanometer in to voltmeter, resistance to be put in series is
R=Vig−G=2.510−2−100=150Ω
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:
B
Current sensitivity of galvanometer =4×10−4 Amp/div.
So full scale deflection current (ig)=Currentsensitivity×Totalnumberofdivision=4×10−4×25=10−2A
To convert galvanometer in to voltmeter, resistance to be put in series is
R=Vig−G=2.510−2−100=150Ω
Was this answer helpful ?
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