Electromagnetic Field Theory

If the electric field intensity associated with a uniform plane electromagnetic wave travelling in a perfect dielectric medium is given by
E(z, t) = 10 cos (2p x 10⁷t - 0.1 pz) volt/metre, then the velocity of the travelling wave is

A 3.0 x 10⁸ m/sec

B 2 x 10⁸ m/sec

C 6.28 x 10⁷ m/sec

D 2 x 10⁷ m/sec

ANS:B - 2 x 10⁸ m/sec

E(z, t) = 10 cos (2p x 10⁷t - 0.1 pz) f = 107 Hz, β = 0.1p

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