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  • I have a doubt, kindly clarify. A galvanometer , whose resistance is 50 ohm , has 25 divisions in it. When a current of 4 X 10-4A passes through it , its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V , i

 A galvanometer , whose resistance is 50 ohm , has 25 divisions in it. When a current of 4 X 10-4 A passes through it , its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V , it should be connected to a resistance of : 

  • Option 1)

    200 ohm

  • Option 2)

    6200 ohm

  • Option 3)

    250 ohm

  • Option 4)

    6250 ohm

Answers (1)

best_answer

 

Conversion of galvanometer into voltameter -

Connected a large Resistance R  in series

- wherein

R_{g}=50\Omega

Number of divisions = N =25

I_{g}=4\times 10^{-4}\times 25=10^{-2}A

\Delta V_{AB}= 2.5V

\Delta V_{AB}= i_{g}\left ( R_{G}+R \right )

2.5= 10^{-2}\left ( 50+R \right )

R = 200\Omega


Option 1)

200 ohm

Option 2)

6200 ohm

Option 3)

250 ohm

Option 4)

6250 ohm

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