write lenz s low for obtainning the direction of induced current
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Lenz's law tells the direction of a current in a conductor loop induced indirectly by the change in magnetic flux through the loop. Scenarios a, b, c, d and e are possible. Scenario f is impossible due to the law of conservation of energy. The charges (electrons) in the conductor are not pushed in motion directly by the change in flux, but by a circular electric field (not pictured) surrounding the total magnetic field of inducing and induced magnetic fields. This total magnetic field induces the electric field.
Lenz's law (pronounced /ˈlɛnts/), named after the physicist Emil Lenz who formulated it in 1834,[1] 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. Or as informally, yet concisely summarised by D.J. Griffiths:
Nature abhors a change in flux.[2]
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 tells the direction of a current in a conductor loop induced indirectly by the change in magnetic flux through the loop. Scenarios a, b, c, d and e are possible. Scenario f is impossible due to the law of conservation of energy. The charges (electrons) in the conductor are not pushed in motion directly by the change in flux, but by a circular electric field (not pictured) surrounding the total magnetic field of inducing and induced magnetic fields. This total magnetic field induces the electric field.
Lenz's law (pronounced /ˈlɛnts/), named after the physicist Emil Lenz who formulated it in 1834,[1] 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. Or as informally, yet concisely summarised by D.J. Griffiths:
Nature abhors a change in flux.[2]
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.
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