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The magnetic field of an electromagnetic wave in a substance is given by B = (2 x 10^-6 T) cos[pi(0.04x + 10^7t)],

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The magnetic field of an electromagnetic wave in a substance is given by B = (2 x 10-6 T) cos[pi(0.04x + 107t)], Find the refractive index substance.

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Comparing the given equation with the standard wave equation

Speed of electromagnetic wave in this medium is 

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