Current Electricity Charging Discharging Of Capacitors Question 598
Question: The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of $ 5,\Omega $ the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell
[KCET 2003; MP PMT 2003]
Options:
A) $ 1.2,\Omega $
B) $ 1.3,\Omega $
C) $ 1.1,\Omega $
D) $ 1.4,\Omega $
Show Answer
Answer:
Correct Answer: C
Solution:
$ E=2.2,volt, $
$ V=1.8,volt, $
$ R=5R $
$ r=( \frac{E}{V}-1 ),R=( \frac{2.2}{1.8}-1 ),\times 5=1.1\Omega $
BETA
