A galvanmeter of resistance G is convert...

A galvanmeter of resistance G is converted into a voltmeter of range 0 -1V by connecting resistance `R_1` in series with it. The additional resistance that should be connected in series with `R_1` to increase the range of the voltmeter to 0-2 V will be :

`R_1`

`R_1 - G`

`R_1 + G`

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