Q. In a potentiometer, the null points are received at 7th wire. If now we have to change the null points at 9th wire, what should we do?
A) Attach resistance in series with battery
B) Increase resistance in main circuit
C) Decrease resistant in main circuit
D) Decrease applied emf
Explanation
(b) To shift the balance point on higher length, the potential gradient of the wire is to be decreased. The same can be obtained by decreasing the current of the main circuit, which is possible by increasing the resistance in series of potentiometer wire.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.