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A galvanometer having a reisstance 12Ome...

A galvanometer having a reisstance `12Omega` gives a full scale deflection for a current f `2.5mA`. It is converted into a voltmeter of range `10V`, what is the net resistasnce of the galvanometer?

A

`3898Omega`

B

`4000Omega`

C

`4Omega`

D

`0.25Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
Additional resistance required
`R=V/(l_(0))-G`
`=10/(2.5xx10^(-3))-12`
`=4000-12=3988Omega`
Since `R` is connected in series, so net resistance of the galvanometer
`=R+G=3988+12`
`=4000 Omega`
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