The range of voltmeter of resistance ' G ' is ' V ' volt. The resistance required to be connected in series with it in order to convert it into a voltmeter of range ' n V ' volt, will be

Step-by-step solution

Here, The range of a voltmeter of resistance G is V volt. Let, I be the current thruogh it then ( G = V I ) (1) Now to convert it into voltmeter of range nV , the required resistance will be, ( R = nV I = nG ) (from (1)) Hence, the resistance to be added in series is ( R - G = nG - G =( n -1) G ) The resistance (( n -1) G ) is to be connected in series with voltmeter of range V in order to convert it into a voltmeter of range nV volt,