Ground waves are polarized in which direction? (a) Vertically upward (b) Horizontal plane (c) Th...

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Ground waves are polarized in which direction?
(a) Vertically upward
(b) Horizontal plane
(c) They are not polarized at all
(d) In a plane that is inclined at an angle of \( 45^{\circ} \) to earths surface
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