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A galvenometer has a resistance of 50 Om...

A galvenometer has a resistance of `50 Omega` and its full-scale deflection current is `50 mu A`. What resistance should be added to it so that it can have a range of `0-5 V`?

Text Solution

Verified by Experts

Given `I_(G) = 50 mu A`. The upper limit gives the maximum
currect to be measured, which is `I = 5 mA`. The galvanomenter ,
resistance is `G = 50 Omega`. Now
`S = (I_(G)G)/(I - I_(G)) = (50 xx 10^(-6) xx 50)/(5 xx 10^(-3) - 50 xx 10^(-6)) = (50 xx 10^(-6) xx 50)/(5 xx 10^(-3)) ~~ 0.5 Omega`
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