Questions
The seave of a galvanometer of resistance 100 contains 25 division. It gives a deflection of one division on passing a current of 4 x 10-4 a ampere. The resistance in ohm to be added to it, so that it may become a voltmeter of range 2.5 volt is
detailed solution
Correct option is B
For full scale deflectionig=25×4×10−4=10−2ampNow, R=Vig−G=2⋅510−5−100=150ΩTalk to our academic expert!
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The ammeter has range 1 ampere without shunt. The range can be varied by using different shunt resistances. The graph between shunt resistance and range will have the nature
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