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Question

How is a galvanometer converted into a volmeter and an ammeter? Draw the relevant diagrams and find the resistance of the arrangement in each case.
Take resistance of galvanometer as G.

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Solution

A galvanometer is converted into a voltmeter by connecting a high resistance R in series with it.
A galvanometer is converted into ammeter by connecting a small resistance (called shunt) in parallel with it.
Resistance of voltmeter, Rv=G+R
Resistance of Ammeter, RA=GrsG+rs

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