Question

The internal resistance of a cell of emf 2V is 0.1Ω It is connected to a resistance of 3.9Ω. The voltage across the cell will be:
a) 0.5V
b) 1.5V
c) 1.95V
d) 2V

Answer 1

Answer:

It is connected to a resistance of 3.9 ohm. The voltage across the cell is 0.5V.

Answer 2

C

1.95 V

r is the internal resistance.

R is the external resistance.

ε is the emf of the cell.

Using Kirchoff's voltage law, −2+I(r+R)=0

I= 42 =0.5A

Potential difference across the cell,V=ε−Ir=2−0.05=1.95V