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Consider a plane electromagnetic wave travelling in free space. The magnetic field is given by
B = B₁ (x − 2) and electric field is given by E = E₁ (− x + 2 y − 2) . Then the direction of the propaga-
tion of the wave is
(a) -x-y-2
(b) x + 2y - 22
(c) 2x + y + 22
(d) None of these

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