The length of a potentiometer wire required to balance the e.m.f of cell (A) is 60cm. The length of the same wire under the same conditions required to balance the e.m.f of cell (B) is 45cm. If the e.m.f of cell (B) is 3.0 volts , the e.m.f of cell (A) is –

Options

A. 2.25 V
B. 2.5 V
C. 4.0 V
D. 4.5 V

Answer

C