Magnetism

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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.

$\left|\frac{d{\mathrm{\Phi }}_B}{dt}\right|=|e.m.f|$

Lenz's Law

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

$e.m.f=-N\frac{d{\mathrm{\Phi }}_B}{dt}$

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.