Current Electricity Charging Discharging Of Capacitors Question 645
Question: When the resistance of 9 W is connected at the ends of a battery, its potential difference decreases from 40 volt to 30 volt. The internal resistance of the battery is
[DPMT 2003]
Options:
A) 6 W
B) 3 W
C) 9 W
D) 15 W
Show Answer
Answer:
Correct Answer: B
Solution:
The internal resistance of battery is given by $ r=( \frac{E}{V}-1 )R=( \frac{40}{30}-1 )\times 9 $
$ =\frac{9\times 10}{30}=3,\Omega $
BETA
