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A galvanometer of resistance 100Omega h...

A galvanometer of resistance `100Omega` has 50 divisions on its scale and has sensitivity of `20 mu`A/ division. It is to be converted to a voltmeter with three ranges, of `0-2V, 0-10V and 0-20V`. The appropriate circuit to do so is:

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B
`i_(g)=20xx50xx10^(-6)=10^(-3) Amp"`
For `0-2v`
`i_(g)(R+r_(1))=2," "r_(1)=1900Omega=R_(1)`
For`" "0-10V`
`i_(g)(R+r_(2))=10," "r_(2)=9900Omega`
`R_(2)=9900-1900=8000Omega`
For `0-20V`
`i_(g)(R+r_(3))=20," "r_(3)=19900 Omega`
`R_(3)=r_(3)-r_(2)=10000Omega`
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