The scale of a galvanometer of resistance 100 Ω Ω 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
Text Solution
Verified by ExpertsThe correct answer is:
B
Current sensitivity of galvanometer = 4 × × 10 –4 Amp/div.
So full scale deflection current (i g ) = Current sensitivity × × Total number of division = 4 × × 10 –4 × × 25 = 10 –2 A
To convert galvanometer in to voltmeter, resistance to be put in series is = 
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