Question

What is the underlying principle of a potentiometer?

Answer 1

Explanation:

Underlying principle of potentiometer: Potential difference across a uniform wire is directly proportional to the length of the part across which the potential is measured when, a steady current flow through the wire. Potentiometer is preferred over voltmeter because potentiometer used the null method.

Answer 2

Answer:

Secondary emf is proportional to the balancing length