A potentiometer consists of a wire of length 4 m and resistance 10 Ω. It is connected to a cell of emf 2 V. The potential gradient of wire is (a) 0.5 V/m (b) 2 V/m (c) 5 V/m (d) 10 V/m

Answer: (a). Ideal cell, so the full 2 V is across the wire. k = 2/4 = 0.5 V/m. So the answer is (a) 0.5 V/m.

A potentiometer consists of a wire of length 4 m and resistance 10 Ω… | NEET 1999 (AIPMT)

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Potentiometer

A potentiometer consists of a wire of length $4\text{ m}$ and resistance $10\ \Omega$ . It is connected to a cell of emf $2\text{ V}$ . The potential gradient of wire is

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Answer: (a)

Ideal cell, so the full 2 V is across the wire.
$k = \frac{2}{4} = 0.5\ \text{V/m}$ .
So the answer is (a) 0.5 V/m.

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Potentiometer question from NEET 1999 (AIPMT)

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