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Q--What is lens law?.....
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Lenz’s law shows that how electromagnetic circuits follow the law of conservation of energy.
When N(north)-pole of a magnet is moved towards the coil, the upper face of the coil acquires north polarity. A force of repulsion acts between the magnet and the coil. Therefore , work has to be done against the force of repulsion, in bringing the magnet closer to the coil.
Similarly, when N-pole of the magnet is moved away, south polarity develops on the upper face of the coil. Now a force of attraction starts to act between the magnet and the coil. Therefore, work has to be done against the force of attraction, in taking the magnet away from the coil.
When we do not move the magnet ,work done is zero. Therefore no induced current is produced.
It is the mechanical work done in moving the magnet w.r.t the coil that changes into electrical energy producing induced current. Thus , the energy is conserved. It only gets transformed
When N(north)-pole of a magnet is moved towards the coil, the upper face of the coil acquires north polarity. A force of repulsion acts between the magnet and the coil. Therefore , work has to be done against the force of repulsion, in bringing the magnet closer to the coil.
Similarly, when N-pole of the magnet is moved away, south polarity develops on the upper face of the coil. Now a force of attraction starts to act between the magnet and the coil. Therefore, work has to be done against the force of attraction, in taking the magnet away from the coil.
When we do not move the magnet ,work done is zero. Therefore no induced current is produced.
It is the mechanical work done in moving the magnet w.r.t the coil that changes into electrical energy producing induced current. Thus , the energy is conserved. It only gets transformed
Answered by
3
Lenz's law, named after the physicist Emil Lenz who formulated it in 1834, states that the direction of the current induced in a conductor by a changing magnetic field is such that the magnetic field created by the induced current opposes the initial changing magnetic field.
Lenz's law is shown by the negative sign in Faraday's law of induction:
{\displaystyle {\mathcal {E}}=-{\frac {\partial \Phi _{\mathbf {B} }}{\partial t}},}

which indicates that the induced electromotive force {\displaystyle {\mathcal {E}}} and the rate of change in magnetic flux {\displaystyle \Phi _{\mathbf {B} }} have opposite signs.[3] It is a qualitative law that specifies the direction of induced current but says nothing about its magnitude. Lenz's law explains the direction of many effects in electromagnetism, such as the direction of voltage induced in an inductoror wire loop by a changing current, or why eddy currents exert a drag force on moving objects in a magnetic field.
Lenz's law can be seen as analogous to Newton's third law in classic mechanics.[4]
For a rigorous mathematical treatment, see electromagnetic induction and Maxwell's equations.
Lenz's law is shown by the negative sign in Faraday's law of induction:
{\displaystyle {\mathcal {E}}=-{\frac {\partial \Phi _{\mathbf {B} }}{\partial t}},}

which indicates that the induced electromotive force {\displaystyle {\mathcal {E}}} and the rate of change in magnetic flux {\displaystyle \Phi _{\mathbf {B} }} have opposite signs.[3] It is a qualitative law that specifies the direction of induced current but says nothing about its magnitude. Lenz's law explains the direction of many effects in electromagnetism, such as the direction of voltage induced in an inductoror wire loop by a changing current, or why eddy currents exert a drag force on moving objects in a magnetic field.
Lenz's law can be seen as analogous to Newton's third law in classic mechanics.[4]
For a rigorous mathematical treatment, see electromagnetic induction and Maxwell's equations.
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