Question:

The expression for the induced emf contains a negative sign $\left( \xi=-\frac{d\phi}{dt}\right)$. The significance of the negative sign is given by the statement

Updated On: Jul 7, 2022
  • The induced emf is produced only when the magnetic flux decreases
  • The induced emf opposes the changes in the magnetic flux
  • The induced emf is opposite to the direction of the flux
  • none of the above
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The Correct Option is D

Solution and Explanation

Induced e.m.f. opposes the cause producing it.
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Concepts Used:

Electromagnetic Induction

Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-

  1. When we place the conductor in a changing magnetic field.
  2. When the conductor constantly moves in a stationary field.

Formula:

The electromagnetic induction is mathematically represented as:-

e=N × d∅.dt

Where

  • e = induced voltage
  • N = number of turns in the coil
  • Φ = Magnetic flux (This is the amount of magnetic field present on the surface)
  • t = time

Applications of Electromagnetic Induction

  1. Electromagnetic induction in AC generator
  2. Electrical Transformers
  3. Magnetic Flow Meter