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JEE Main202325 Jan 2023Morning ShiftPhysicsElectromagnetic WavesActual

All electromagnetic wave is transporting energy in the negative z direction. At a certain point and certain time the direction of electric field of the wave is along positive y direction. What will be the direction of the magnetic field of the wave at that point and instant?

Options

  1. APositive direction of x
  2. BPositive direction of z
  3. CNegative direction of x
  4. DNegative direction of y

Correct answer

A. Positive direction of x

Step-by-step solution

In an electromagnetic wave, the direction of energy flow is along the direction of the wave propagation. Therefore, the wave propagates along negative z direction. Electric field is along the positive y direction and the wave propagates along negative z direction. Thus, magnetic field is in direction perpendicular to both z and y axes. Using vector algebra, ( - k ^ ) = ( + j ^ ) × i ^ Hence, magnetic field is in positive x direction.

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