1.

Two scales on a voltmeter measure voltage up to `20.0V` and `30.0 V`. The resistance connected in series with the galvanometer is `1680 Omega` for the `20.0 V` scale and `2930 Omega` for the `30.0 V` scale. The resistance of the galvanometer and the full scale current are respectivelyA. `320 Omega and 8 mA`B. `70 Omega and 10 mA`C. `820 Omega and 10mA`D. `0.05mA`

Answer» Correct Answer - D
`(1680+r)I=20`
`(2930+r)I=30`
`2xx2930+2r=3 xx 1680+3r`
`r=820`


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