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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

`120 Omega`

B

`100 Omega`

C

`125 Omega`

D

`80 Omega`

Text Solution

Verified by Experts

Since `V=I_gR_g [1+R_v/R_g] ,15=0.005 times 30 times 20[1+R_v/20] implies R_v/20=15/(0.15 times 20)-1 implies R_v=80 Omega`
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