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A galvanometer of resistance G is conver...

A galvanometer of resistance G is converted into a voltmeter to measure upto V volts by connecting a resistance `R_1` in series with the coil. If a resistance `R_2` s connected in series with it then it can measure upto `V/2` volts Find the resistance R, in terms of `R_1` and `R_2` required to convert it into a voltmeter that can read upto 2V volts.

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