Asked in ETEA MDCAT 2012 2012Moderate

Lenz's law is a particular form of the law of conservation of:

Correct answer: C. Energy

  • A. Charge
  • B. Current
  • C. Energy
  • D. Magnetic field

Explanation

Lenz's law exemplifies the law of conservation of energy. It states that the induced electromotive force (emf) in a closed loop will generate a current whose magnetic field opposes the change in magnetic flux that produced it. This opposition ensures that energy is neither created nor destroyed but transformed from one form to another. For instance, when a magnet approaches a coil, the induced current opposes the motion, converting mechanical energy into electrical energy.Other options:Charge: While charge conservation is a fundamental principle, Lenz's law does not pertain to it.Current: Although related to currents, Lenz's law is not a specific form of current conservation.Magnetic field: Lenz's law involves the effects of changing magnetic fields but does not imply conservation of magnetic fields themselves.

Last updated

About Lenz's Law

Lenz's law states that the induced current flows in a direction that opposes the change in magnetic flux producing it. Questions connect this rule with Faraday's law, magnetic flux, induced emf and the direction of motion or current, while distinguishing opposition to flux change from opposition to the magnetic field itself.

Practise Electromagnetic Induction

288 free Electromagnetic Induction MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.

Exams that ask Physics questions like this

Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.

Related questions