Question

if the resistance of the galvanometer is 40ohm and high resistance of 2000ohm is connected I'm series with it to convert into voltmeter then the net resistance of voltmeter is​

Answer 1

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Class 12

PHYSICS

MAGNETIC EFFECT OF CURRENT AND MAGNETISM

A galvanometer can be converted into a voltmeter of certain range by connecting a resistance of 880Omega in series with it. When the resistance of 420Omega is connected in series, the range becomes half. Find the resistance of galvanometer.

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Updated On: 25-6-2020

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Let G be the resistance of galvanometer. If a resistance R is connected in series of galvanometer it works as a voltmeter of range 0 to V volt. The current for full scale deflection of a voltmeter is <br>

<br> In first case,

<br> In second case,

<br>

<br> or

or