Q. The potential gradient along the length of a uniform wire is $10Vm^{- 1}.$The length of the potentiometer wire is 4 m. What is the potential difference across two points on the wire separated by 50cm?
A) 2.5 V
B) 5.0 V
C) 1.25 V
D) 4.0 V
Explanation
(b) Here, potential gradient, $K = 10Vm^{- 1}$;
Potential difference across length $l = Kl$
$= 10 \times 0.5 = 5\ V$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.