Q. 205.0( 1 Vote )

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Answer :

When a current-carrying coil is placed in a magnetic field, it experiences a torque. From the measurement of the deflection of the coil, the strength of the current can be computed. A high resistance is connected in series with the galvanometer to convert it into voltmeter. The value of the resistance is given by:



Here, V= potential difference across the terminal of the voltmeter


= Current through galvanometer


G= Resistance of the galvanometer


When the resistance is connected in series with the galvanometer.


V=I (G+)


When the resistance is connected in series with the galvanometer.


=I (G+)



G=


Let be the resistance required for conversion into voltmeter of range 2V



Also V=




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