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A galvanometer With a 1 mA full scale deflec tion and internal resistance of 500 ohm is to be used as volmeter. Find series resistance fo 1 v and 10 v ranges.
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Answer: Given : Full scale deflection current (Ig)=1×103A

internal resistance Rg=500Ω

Voltage range V=1V, V=10V

To find : series resistance - ?

Formula : R=VIgRg

Solution :  R=VIgRg=1103500=500Ω

R=VIgRg=10103500=9,500Ω

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