Magnetism

Faraday's Law
The magnitude induced EMF through a loop of conducting material is equal to the magnitude of the time derivative rate of change of the magnetic flux through that loop.


 * $$\left|\frac{d\Phi_{B}}{dt}\right| = \left|e.m.f\right|$$

Lenz's Law
The polarity of the induced EMF is such that oppose the changes/current that causes it.


 * $$e.m.f = -N\frac{d\Phi_B}{dt}$$

Magnetic Field Strength
Magnetic Field Strength is defined as the force on one metre of wire carrying a current of one amp at right angles to the magnetic field. Magnetic Field Strength is also called flux density and is measured in teslas, T.