Biot savarts law
A wire carrying current produces magnetic field all around it.The intensity at any point can be determined by Biot-savart's law.
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What is modulation ?
It is the process by which some feature (amplitude, frequency etc.) of the carrier wave is varied in accordance with the intensity of signal wave.
Mean free path.
The mean free path is defined as the mean distance traversed by a molecule between successive collisions.
Saddle point.
It is a point where function is neither maximum nor minimum.Geometrically such a surface forms a ridge rising in one direction & falling in another direction.
Permeability(μ).
It is defined as ratio between magnetic induction(B) to the magnetising field strength(H). I.e μ=B/H
Plane progressive wave.
A plane progressive wave is one which travels onward through the medium in a given direction without attenuation( i.e amplitude constant).