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JEE Main20202 Sep 2020Evening ShiftPhysicsElectromagnetic WavesActual

In a plane electromagnetic wave, the directions of electric field and magnetic field are represented by k ^ and 2 i ^ - 2 j ^ , respectively. What is the unit vector along direction of propagation of the wave.

Options

  1. A1 2 ( i ^ + j ^ )
  2. B1 2 ( j ^ + k )
  3. C1 5 ( i ^ + 2 j ^ )
  4. D1 5 ( 2 i ^ + j ^ )

Correct answer

A. 1 2 ( i ^ + j ^ )

Step-by-step solution

E → × B → ‖ C → E ^ × B ^ = 1 2 i ^ j ^ k ^ 0 0 1 1 - 1 0 = i ^ + j ^ 2 ⇒ c ^ = i ^ + j ^ 2

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