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When series resistance is increased, range of voltmeter _______

Answer»

decreases
increases
remains constant
none of above

Solution :Value of SERIES resistance, required to make resistance of a VOLTMETER N times,
`R_(S)=G(n-1)`
`thereforeR_(S)=G_(n)-G`
`thereforen=(R_(S)+G)/G`
`rArr` if `R_(S)` is INCREASED then n increases.
`rArr` New voltage capacity `V=nV_(G)=nI_(G)` will INCREASE.
`rArr` Range will increase.


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