Question

Find the true statement.

(a) Motional emf is inversely proportional to speed of electric conductor

(b) Motional emf is inversely proportion to the length of the conductor

(c) Motional emf is directly proportional to the magnetic field

(d) Motional emf is inversely proportional to the magnetic field

This question was addressed to me in an interview for job.

My enquiry is from Electromagnetic Induction in section Electromagnetic Induction of Physics – Class 12

Answer 1

The correct choice is (c) Motional emf is directly proportional to the magnetic field

For explanation: Motional emf is directly proportional to the magnetic field across which the electric conductor moves. It is also directly proportional to the \(\frac {velocity}{speed}\) of the electric conductor as well as to the length of the conductor. All the other statements are not valid.