Current Electricity Charging Discharging Of Capacitors Question 230
Question: In an experiment to measure the internal resistance of a cell by potentiometer, it is found that the balance point is at a length of 2m when the cell is shunted by a $ 5,\Omega $ resistance; and is at a length of 3m when the cell is shunted by a $ 10,\Omega $ resistance. The internal resistance of the cell is, then
[Haryana CEE 1996]
Options:
A) $ 1.5,\Omega $
B) $ 10,\Omega $
C) $ 15,\Omega $
D) $ 1,\Omega $
Show Answer
Answer:
Correct Answer: B
Solution:
$ r=( \frac{l _{1}-l _{2}}{l _{2}} )\times R’ $
$ =( \frac{l _{1}-2}{2} )\times 5 $ … (i) and $ r=( \frac{l _{1}-3}{3} )\times 10 $ … (ii) On solving (i) and (ii) r = 10 W
BETA
