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Two scales on a voltmeter measure voltag...

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 respectively

A

`320 Omega and 8 mA`

B

`70 Omega and 10 mA`

C

`820 Omega and 10mA`

D

`0.05mA`

Text Solution

Verified by Experts

The correct Answer is:
D
`(1680+r)I=20`
`(2930+r)I=30`
`2xx2930+2r=3 xx 1680+3r`
`r=820`
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