First slide

potentiometer

Question

The potential gradient along the length of a uniform wire is 10 volt/metre. B and C are the two points at 30 cm and 60 cm point on a meter scale fitted along the wire. The potential difference between B and c will be

Easy

A

3 volt
B

0.4 volt
C

7 volt
D

4 volt

Solution

Potential gradient = Change in voltage per unit length
$∴ 10 = \frac{V_{2} - V_{1}}{30 / 100} \Rightarrow V_{2} - V_{1} = 3 volt$

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