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Question

The scale of a galvanometer of resistance 100Ω  contains 25 divisions. It gives a deflection of one division on passing a current of 4×104 A. The resistance in ohms to be added to it, so that it may become a voltmeter of range 2.5 volt is
  1. 100
  2. 150
  3. 300
  4. 250


Solution

The correct option is B 150
Current sensitivity of galvanometer =4×104 Amp/div.
So full scale deflection current (ig)=Current sensitivity×Total number of division=4×104×25=102 A
To convert galvanometer in to voltmeter, resistance to be put in series is
R=VigG=2.5102100=150Ω

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