Current Electricity Ques 74
- In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across $52$ $ cm$ of the potentiometer wire. If the cell is shunted by a resistance of $5$ $ \Omega$, a balance is found when the cell is connected across $40 $ $cm$ of the wire. Find the internal resistance of the cell.
(2018 Main)
(a) $1 $ $\Omega$
(b) $2 $ $\Omega$
(c) $1.5 $ $\Omega$
(d) $2.5 $ $\Omega$
Show Answer
Answer:
Correct Answer: 74.(c)
Solution:
Formula:
- Using formula, $r=R (\frac{l _1}{l _2}-1)=5 (\frac{52}{40}-1)=5 \times \frac{12}{40}=1.5 $ $\Omega$
BETA
