A galvanometer of resistance has 50 divisions on its scale and has sensitivity of division. It is to be converted to a voltmeter with three ranges, of , and . The appropriate circuit to do so is :
Conversion of galvanometer into voltameter -
Connected a large Resistance in series
option (2) can not ever be appropriate circuit because we can not measure high voltage i.e 20V before smaller voltage i.e 2V, because if the higher voltage is at the end then the resistance is large and hence more range.