When series resistance is increased, range of voltmeter _______

Options

A. decreases
B. increases
C. remains constant
D. none of above

Answer

B

Explanation

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.