https://www.khanacademy.org/science/physics/magnetic-forces-and-magnetic-fields/magnetic-flux-faradays-law/v/lenzs-law
https://www.khanacademy.org/science/physics/magnetic-forces-and-magnetic-fields/magnetic-flux-faradays-law/a/what-is-faradays-law
http://www.s-cool.co.uk/a-level/physics/lenzs-law/revise-it/lenzs-law
| When a bar magnet
is brought close to an insulated coil of wire it produces
flux which induces a current in the coil of wire. So
imagine a loop in the plane of a piece of paper. You push
the north pole into the loop (into the page), thus
increasing the flux into the page. The induced magnetic
field will oppose that increase and thus point out of the
page. Lenz's law states that the induced current in the loop is such that the induced magnetic field opposes the change in the flux. You can solve this yourself by using the right hand rule to find out which direction the forces are pointing. Take your thumb and point it in the direction of the current. Curl your fingers, that will be the direction of the magnetic field. The magnetic filed direction always opposes that of the flux. Reference https://www.physicsforums.com/threads/lenzs-law-and-electromagnetic-induction.161329/ |
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