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A galvanometer of resistance 500 Omega g...

A galvanometer of resistance `500 Omega `gives a full scale deflection, for a current of `20mA`. Even without using a high resistance in series, it can be used as a voltmeter. The range of the voltmetr will be

A

`0-5V`

B

`0 -10V`

C

`0-15V`

D

`0-20V`

Text Solution

Verified by Experts

The correct Answer is:
B
`S/G=I_g/(I-I_g)-(1/10/9/10)=1/9 therefore S=G/9=11Omegatherefore G/S=99/11=9:1`
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