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A galvanometer having a resistance of ...

A galvanometer having a resistance of `20 Omega` and 30 divisible on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is :

A

`100 Omega`

B

`120 Omega`

C

`80Omega`

D

`125 Omega`

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