what is lenz law ?How energy conserved in it.
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Lenz's law is a common way to understand how electromagnetic circuits obey Newton's third law and the conservation of energy.[1]Lenz's law is named after Heinrich Lenz, and it says:
An induced electromotive force (emf) always gives rise to a current whose magnetic field opposes the change in original magentic flux.
Lenz's law is shown with the negative sign in Faraday's law of induction
which indicates that the induced emf (ℰ) and the change in magnetic flux (∂ΦB) have opposite signs.[2]
The induced emf and the resulting induced current are counterclockwise when B is directed out from the page and the area of the circuit is decreasing. The flux through this circuit is decreasing in the outward direction. Now the induced current I produces its own magnetic field, and we may use the right-hand grip rule to compute the direction of this field. The result is that the magnetic field due to the induced current is also directed outward within the circuit. It is as though nature, through this induced field, tried to compensate for the reduction in the flux due to the applied field B. This turns out experimentally to be a general rule, so that we may say that
The direction of the induced emf is always such as to result in opposition to the change producing it.
That is Lenz's law.
An induced electromotive force (emf) always gives rise to a current whose magnetic field opposes the change in original magentic flux.
Lenz's law is shown with the negative sign in Faraday's law of induction
which indicates that the induced emf (ℰ) and the change in magnetic flux (∂ΦB) have opposite signs.[2]
The induced emf and the resulting induced current are counterclockwise when B is directed out from the page and the area of the circuit is decreasing. The flux through this circuit is decreasing in the outward direction. Now the induced current I produces its own magnetic field, and we may use the right-hand grip rule to compute the direction of this field. The result is that the magnetic field due to the induced current is also directed outward within the circuit. It is as though nature, through this induced field, tried to compensate for the reduction in the flux due to the applied field B. This turns out experimentally to be a general rule, so that we may say that
The direction of the induced emf is always such as to result in opposition to the change producing it.
That is Lenz's law.
niharika21:
how energy is conserved
In physics, the law of conservation of energy states that the total energy of an isolated system in a given frame of reference remains constant — it is said to be conserved over time.[1] In other words, this law means that energy can neither be created nor destroyed; rather, it can only be transformed from one form to another.
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