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Q.

A galvanometer gives full scale deflection with 0.006A current. By connecting it to a 4990Ω resistance, it can be converted into a voltmeter of range 0-30V. If connected to a 2n/249Ω resistance, it becomes an ammeter of range 0-1.5A. The value of n is

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answer is 5.

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Detailed Solution

V=igG+R

30=0.006G+4990⇒G=10ΩS=Gigi−ig2n249=0.006×101.5−0.006

n=5

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