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It is the opposition offered by the material of the flux.
Reluctance α mean length of flux path and reluctance α 1/cross section A
Reluctance=1/μ0μrA
Here μ0 and μr are the permeability of free space and relative permeability of material respectively.
Particles of the medium implement simple harmonic motion about their mean position in a direction perpendicular to the direction of propagation of wave motion. (i) It goes in th
define the coefficient of friction
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