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  • A galvanometer has a resistance of 30 and a current  of 2mA  is needed for a full scale deflection.

A galvanometer has a resistance of 30\Omega and a current  of 2mA  is needed for a full scale deflection. The resistance (in \Omega )  that should be used to convert it into a voltmeter of 0.2V range is

Option: 1

70


Option: 2

60


Option: 3

80


Option: 4

90


Answers (1)

best_answer

As we learnt

 

Conversion of galvanometer into voltameter -

 

Connected a large Resistance R  in series

- wherein

 

 To convert galvanometer into voltmeter of 0.2V range

V=I_g.(R+G)

\Rightarrow 0.2=2*10^{-3}*(30+R)

or\: \: R=70\Omega

 

Posted by

Anam Khan

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