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  • A galvanometer of 50-ohm resistance has divisions. A current of  ampere gi

A galvanometer of 50-ohm resistance has divisions. A current of 4 \times 10^{-4} ampere gives a deflection of one per division. To convert the galvanometer into a voltmeter having a range of 25 volts. It should be connected with a resistance of- 

Option: 1

2450\Omega


Option: 2

2500\Omega


Option: 3

245\Omega


Option: 4

2550\Omega


Answers (1)

best_answer

\begin{aligned} R g= & 50 \Omega, I g=25 \times 4 \times 10^{-1} \Omega=10^{-2} \mathrm{~A} \\ & \text { Range of } V=25 \text { volts } \\ V= & I_{g}\left(R_{e}+R_{g}\right) \Rightarrow R_{e}=\frac{V}{I g}-R g=2450 \Omega \end{aligned}

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