Lenz's law and energy conservation in …

Lenz’s law

• According to Lenz’s law:-The polarity of the induced emf is such that it tends to produce induced current in such a direction that it opposes the change in magnetic flux that produced it.
• The (-) ive sign in given equatione= (-) (dΦ/dt)tells about the direction.
• According to Faraday’s law whenever there is change in the magnetic flux, emf is induced, as aresult there will be induced current.
• According to Lenz’s law the direction of the induced current will be such that it opposes the change in the magnetic flux.

Lenz’s law: supports Conservation of energy

• Lenz’s law obeys conservation of energy.
• Magnet is moving as a result current is getting induced and when the magnet is not moving there is no induced current in the coil.
• There is a mechanical energy involved with the movement of the as magnet as a result mechanical energy is converted into electrical energy which is produced by the induced current.
• Magnetic energy used in moving magnet is getting transformed into electrical energy which is produced by the induced current.
• This shows that Lenz’s law supports conservation of energy where one form of energy is getting transformed into another form.
• Work done in moving the magnet is dissipated by Joule heating produced by the induced current.