Why does the e.m.f. of a galvanic cell decrease on drawing current from it? When does it fall to zero
A cell of e.m.f. 4 V and of negligible internal resistance is connected in series with a potentiometer wire of length 400 cm. The e.m.f. of a Leelanche cell is found to be balacned at 150 cm from the positive end of the potentiometer wire. What is the e.m.f. of the Leclanche cell ?
If the e.m.f. of a driving cell be decreased. What will be effect on the positions of zero deflection in a potentionmeter? Explain.
