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NEET 2008 (AIPMT) · Potentiometer

Potentiometer question from NEET 2008 (AIPMT)

Q84NEET 2008 · AIPMTMedium

Potentiometer

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

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Answer: (c)

Open-circuit length is the larger one: $l_0 = 110$ cm; shunted by $10\ \Omega$ : $l = 100$ cm.
$r = R\dfrac{l_0-l}{l} = 10\times\dfrac{110-100}{100}$
$r = 1\ \Omega$
So the answer is (c) 1.0 ohm.

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