Question

An induced emf has

• A. A direction same as field direction
• B. A direction opposite to the field direction
• C. No direction of its own
• D. Non of these

Answer 1

Answer: (C)

No direction of its own

From Lentz's law, the direction of induced emf in a circuit is such that it opposes the magnetic flux that produces it.
So, if the magnetic flux linked with a closed circuit increases the induced current flows in a direction so as to develop a magnetic flux in the opposite direction of original flux.
If the magnetic flux linked with a closed circuit decreases then the induced current flows in the same direction of the original flux. So, the induced emf has not direction of its own.