Q107 / 120 · VITEEE 2015 · Physics

An induced emf has

  • A
    a direction same as field direction
  • B
    a direction opposite to the field direction
  • Correct answer
    C
    no direction of its own
  • D
    None of the above

Solution

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 original flux. So, the induced emf has not direction of its own.

Hence, the correct answer is option: 'C'.

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