In a potentiometer experiment, the galvanometer shows no deflecti… - Vidyadip

MCQ

In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across $60 \mathrm{~cm}$ of the potentiometer wire. If the cell is shunted by a resistance of $6 \Omega$, the balance is obtained across $50 \mathrm{~cm}$ of the wire. The internal resistance of the cell is

A
$0.5 \Omega$
B
$0.6 \Omega$
✓
$1.2 \Omega$
D
$1.5 \Omega$

✓

Answer

Correct option: C.

$1.2 \Omega$

(c) $r=\frac{\left(l_1-l_2\right)}{l_2} \times R^{\prime}=\left(\frac{60-50}{50}\right) \times 6=1.2 \Omega$

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