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A range of galvanometer is V when `50 Omega` resistance is connected is connected in series its range gets doubled when `500 Omega` resistance is connected in series galvanometer resistance isA. `100 omega`B. `200 omega`C. `300 omega`D. `400 omega`

Answer» Correct Answer - b
A galvanometer is converted into a voltmeter when ahigh resistance is connected to it in series
If I is maximum current flowing through galvanometer then
`V= (R+G)I=(50+G)I`
where V is the range of galvanometer when R= 50 `omega` is connected in series with it and g is galvanometer resistance
when 500 `omega` resistnce is conncected in series the range becomes double
`2V=(500 +G)I`
or `500 +G =100 +2G rarr G= 400 omega`


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