GATE EC 2012 Electromagnetics Solution Q 10

GATE EC 2012 Electromagnetics Solution Q 10

The magnetic field along the propagation direction inside a rectangular waveguide with the cross-section shown in figure is

H_z=3\;\cos\left(2.094\times10^2x\right)\cos\left(2.618\times10^2y\right)\cos\left(6.283\times10^{10}t-\beta z\right)
GATE EC 2012 Electromagnetics Solution - Grad Plus

The phase velocity vp of the wave inside the waveguide satisfies_____.

a) v_p>\;c

b) v_p=\;c

c) 0\;<\;v_p\;<\;c

d) v_p=0

Ans-(a)

Explanation

Phase velocity is always greater than c inside a waveguide.

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