Q125 / 199 · NEET 2008 (Mains) · Physics

A cell can be balanced against $110 \mathrm{~cm}$ and $100 \mathrm{~cm}$ of potentiometer wire, respectively with and without being short circuited through a resistance of $10 \Omega$. Its internal resistance is

A
Zero
Correct answer
B
$1.0 \mathrm{ohm}$
C
$0.5 \mathrm{ohm}$
D
$2.0 \mathrm{ohm}$

Solution

Internal resistance $=\left(\frac{110}{100}-1\right) \times 10 \Omega$

Hence, the correct answer is option: 'B'.

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