According to faraday's law of electromagnetic induction why a coil tries to oppose the flux?
Answers
The magnetic flux (often denoted Φ or ΦB) through a surface is the component of the magnetic field passing through that surface. The magnetic flux through some surface is proportional to the number of field lines passing through that surface. The magnetic flux passing through a surface of vector area A is
where B is the magnitude of the magnetic field (having the unit of Tesla, T), A is the area of the surface, and θ is the angle between the magnetic field lines and the normal (perpendicular) to A.
For a varying magnetic field, we first consider the magnetic flux
through an infinitesimal area element dA, where we may consider the field to be constant
Varying Magnetic Field: Each point on a surface is associated with a direction, called the surface normal; the magnetic flux through a point is then the component of the magnetic field along this normal direction
A generic surface, A, can then be broken into infinitesimal elements and the total magnetic flux through the surface is then the surface integral
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The minus sign in Faraday's law of induction is very important. The minus means that the EMF creates a current I and magnetic field B that oppose the change in flux Δthis is known as Lenz' law. ... The current induced in the coil creates another field, in the opposite direction of the bar magnet's to oppose the increase