An electric cell has an internal resistance of 2 ohms. A current of 0.5A is found to flow when a resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell?
A
5 volts
B
3.5 volts
C
2.5 volts
D
1 volts
E
10 volts
Verified Correct Answer: B.
Physical Principles & Numerical Solution
E.m.f. = I(R + r) = 0.5(2+5) = 3.5 volts
Source: Myschool Past Questions Archive (Record #29202)