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A galvanometer has a resistance 100Omega...

A galvanometer has a resistance `100Omega` and gives a full scale deflection for a current of 0.1 A. It is to be converted into a voltmeter of range of 50 V. The resistance of voltmeter so formed is

A

`400 Omega`

B

`500 Omega`

C

`200Omega`

D

`80 Omega`

Text Solution

Verified by Experts

The correct Answer is:
B

`(F_m)/(F_e)=(v^2)/(c^2)=((3xx10^5)^2)/((3xx10^8)^2)=10^-4`.
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