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A galvanometer having a resistance of 20...

A galvanometer having a resistance of `20Omega` and 30 divisions on both sides has figure of merit. 0.005 ampere /division. The resistance that should be connected in series such that it can be used as a voltmeter unto 15 V , is :

Text Solution

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Deflection current
`Ig_("max")=nxk=0.005xx30`
Where n=Number of divisions =30 and k=0.005
amp/division
`=15xx10^(-2)=0.15`
`v=I_(g)[20+R]`
`15=0.15[20+R]`
`100=20+R`
`R=80Omega`
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