Q. A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves :
A) cells
B) potential gradients
C) a condition of no current flow through the galvanometer
D) a combination of cells, galvanometer and resistances
Explanation
[Solution] At balance no current is drawn from the cell, so the true emf is measured. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.