Current Electricity Charging Discharging Of Capacitors Question 595
Question: The potential difference in open circuit for a cell is 2.2 volts. When a 4 ohm resistor is connected between its two electrodes the potential difference becomes 2 volts. The internal resistance of the cell will be
[MP PMT 1984; SCRA 1994; CBSE PMT 2002]
Options:
A) 1 ohm
B) 0.2 ohm
C) 2.5 ohm
D) 0.4 ohm
Show Answer
Answer:
Correct Answer: D
Solution:
$ (4+r)i=2.2 $ ……(i) and $ 4i=2 $
Therefore $ i=\frac{1}{2} $ Putting the value of i in (i), we get r = 0.4 ohm.
BETA
