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Sticky Note
For an electromagnetic wave the direction of the vector EXB gives _____?
برقی مقناطیسی لہر کے لئے ویکٹر ایکس بی کی سمت _____ دیتا ہے؟
  1. The direction of the wave propagation
  2. The direction of the electromagnetic force on a proton
  3. The direction of the electric field
  4. None of these
Explanation
  • In an electromagnetic wave, the electric field (E) and magnetic field (B) are perpendicular to each other, and their cross product (E × B) gives the direction of wave propagation.
  • This follows from Maxwell’s equations, which describe the movement of EM waves in space.

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