11.To convert a galvanometer into voltmeter, one should connect:

12.The resistance of the series combination of two resistances is S. When they are joined in parallel, the total resistance is P. If S = nP, then the minimum possible value of n is:

13.The sensitivity of a potentiometer can be increased by:

14.For accurate measurements, the resistance of a voltmeter should be:

15.A big dry cell A and a small dry cell B have the same emf. The internal resistance of A: