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A galvanometer has a coil of resistance ...

A galvanometer has a coil of resistance `100 Omega` and gives a full-scale deflection for `30 mA` current. If it is to work as a voltmeter of `30 V` range, the resistance required to be added will be

A

`900 Omega `

B

`1800 Omega `

C

`500 Omega `

D

`1000 Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
Let required resistance be R then
`(R+R_(g))I_(g)=Vimplies (R+100)(30xx10^(-3))=30`
`implies R=900 Omega `
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