Lenz's Law & Conservation of Energy

# Lenz's Law & Conservation of Energy Video Lecture | Physics Class 12 - NEET

## Physics Class 12

158 videos|453 docs|185 tests

## FAQs on Lenz's Law & Conservation of Energy Video Lecture - Physics Class 12 - NEET

 1. What is Lenz's Law?
Ans. Lenz's Law states that the direction of the induced current in a conductor will always be such that it opposes the change in magnetic field that produced it. In simpler terms, when a magnetic field changes near a conductor, an electric current is induced in the conductor that creates a magnetic field opposing the original change.
 2. How does Lenz's Law relate to conservation of energy?
Ans. Lenz's Law is closely related to the conservation of energy. According to the law, the induced current always opposes the change in magnetic field. This opposition creates an electromagnetic force that acts against the original source of the changing magnetic field. By doing so, Lenz's Law ensures that energy is conserved in the system, as the work done by the induced current is equal to the work done on the system by the changing magnetic field.
 3. Can you provide an example that demonstrates Lenz's Law?
Ans. Sure! Let's consider a scenario where a bar magnet is moved towards a coil of wire. As the magnet approaches the coil, the magnetic field through the coil increases. According to Lenz's Law, an induced current will flow in the coil in such a way that it creates a magnetic field that opposes the increasing magnetic field of the approaching magnet. This induced current creates a force that resists the motion of the magnet, thus demonstrating Lenz's Law.
 4. How can Lenz's Law be applied in real-life applications?
Ans. Lenz's Law has various practical applications. One common application is in electric generators, where the relative motion between a magnet and a coil of wire induces an electric current. Lenz's Law ensures that the induced current flows in a direction that opposes the motion of the magnet, generating electricity. Another application is in electromagnetic braking systems, where Lenz's Law is used to create a magnetic field that opposes the motion of a rotating conductor, leading to effective braking.
 5. What happens if Lenz's Law is violated?
Ans. Lenz's Law is a fundamental principle in electromagnetism, and violating it would mean violating the conservation of energy. If Lenz's Law is violated, it would imply that energy is not conserved in the system. This would contradict the well-established laws of physics and would have significant implications on our understanding of electromagnetism. However, scientific experiments and observations consistently support the validity of Lenz's Law.

## Physics Class 12

158 videos|453 docs|185 tests

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