
The sensitivity of a potentiometer can be increased by
(A) Increasing the series resistance in the primary circuit
(B) Decreasing the length of the potentiometer wire
(C) Using a thin and high resistivity wire as a potentiometer wire
(D) Increasing the length of the wire
Answer
149.1k+ views
Hint: A potentiometer may be a three-terminal resistor with a sliding or rotating contact that forms an adjustable potential divider which is used as a controller dial in various machines. If only two terminals of the potentiometer are used, that is, one end of the potentiometer and the wiper, it acts as a variable resistor or a rheostat. Keeping this in mind we can answer the given question.
Complete step-by step answer:
The sensitivity of a potentiometer is inversely proportional to its potential gradient.
With an increase in the series resistance of the wire, the potential gradient of the wire decreases which in turn helps us to measure the emf more accurately.
Also Increase in the length of the wire decreases and the potential gradient of the wire helps us to measure the emf more accurately.
Hence, the correct answer is Option D.
Note: Usually the two ends of a potentiometer acts as the two extremes of a range of resistances and the middle pin acts as a pin to vary the overall resistance provided by the potentiometer. It is a mechanical device capable of alternating the flow of current through it.
Complete step-by step answer:
The sensitivity of a potentiometer is inversely proportional to its potential gradient.
With an increase in the series resistance of the wire, the potential gradient of the wire decreases which in turn helps us to measure the emf more accurately.
Also Increase in the length of the wire decreases and the potential gradient of the wire helps us to measure the emf more accurately.
Hence, the correct answer is Option D.
Note: Usually the two ends of a potentiometer acts as the two extremes of a range of resistances and the middle pin acts as a pin to vary the overall resistance provided by the potentiometer. It is a mechanical device capable of alternating the flow of current through it.
Recently Updated Pages
Wheatstone Bridge - Working Principle, Formula, Derivation, Application

Young's Double Slit Experiment Step by Step Derivation

JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Atomic Structure and Chemical Bonding important Concepts and Tips

JEE Amino Acids and Peptides Important Concepts and Tips for Exam Preparation

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Uniform Acceleration

Learn About Angle Of Deviation In Prism: JEE Main Physics 2025

Electric Field Due to Uniformly Charged Ring for JEE Main 2025 - Formula and Derivation

Electric field due to uniformly charged sphere class 12 physics JEE_Main

Other Pages
JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

JEE Advanced 2025: Dates, Registration, Syllabus, Eligibility Criteria and More

JEE Advanced Weightage 2025 Chapter-Wise for Physics, Maths and Chemistry

Degree of Dissociation and Its Formula With Solved Example for JEE

Electrical Field of Charged Spherical Shell - JEE

Charging and Discharging of Capacitor
