Published by:
CGP EDU Academic Team
Published on: August 23, 2026
A potentiometer wire of length 
is connected in series with a resistance 
and a standard cell of emf 
. A constant current flow through potentiometer wire. The length of the null point for cell of emf 
is found to be 
. The resistance of the potentiometer wire is 
.
Text Solution
Verified by ExpertsThe correct answer is:
20
(20)
Let resistance of potentiometers wire is 
Potential difference across 
Potential difference across AC
This should be equal to 
──────────────────────────────────────────────────────────────────────────────────────────
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
PART-I PHYSICS
SECTION-A
Two projectiles are thrown with same initial velocity making an angle of …
In a Vernier Calipers. 10 divisions of Vernier scale is equal to the 9 divisions of main scale. Whe…
A ball of mass hits the wall with its initial speed of and bounces back without changing its init…
A body of mass and another of mass are moving with equal kinetic energy. The ratio of their respe…
Two uniformly charged spherical conductors A and of radii and are separated by a distance of . …
The oscillating magnetic field in a plane electromagnetic wave is given by . The amplitude of ele…