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A galvanometer can be converted into either an ammeter or a voltmeter. Before conversion, which of the following thing about the galvanometer you are required to know.
i) Resistance of the galvanometer
ii) The magnetic field in which the coil is rotating
iii) Current for full scale deflection of galvanometer
iv) Nature of its construction

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Only i is true

Only ii is true

Only i & ii are true

Only i & iii are true

answer is D.

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Detailed Solution

For ammeter: $i = (\frac{G}{G + S}) i_{g}$

For voltmeter: $V = i_{g} (R + G)$

So, for required range required value of R and S will be used and $i_{g} and G$ will be required for conversion of a galvanometer into voltmeter or ammeter.

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