a
A galvanometer has its own resistance low but a voltmeter must have high resistance. \(A\) voltmeter indeed is a modified form of a pivoted coil galvanometer. since the resistance of coil of galvanometer of its own is low, its resistance is to be increased as is a necessary condition for a voltmeter. For this an appropriate high resistance should be connected in series with the galvanometer as shown.
Note\(:\)The resistance of an ideal voltmeter should be infinite.
