Why do we say that Lenzs Law indicates the direction of the

Why do we say that Lenz\'s Law indicates the direction of the induced current?

Solution

\"An induced current is always in such a direction as to oppose the motion or change causing it\"

The law provides a physical interpretation of the choice of sign in Faraday\'s law of induction, indicating that the induced emf and the change in flux have opposite signs.

If the magnetic field associated with the current in a conductor were in the same direction as the change in magnetic field that created it, these two magnetic fields would combine to give a net magnetic field which would in turn induce a current with twice the magnitude. This process would continue creating infinite current from just moving a magnet: this would be a violation of the law of conservation of energy.