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  4. Assertion In an electromagnetic waves, the direction of the magnetic field induction B is parallel to the electric field E. Reason Electric field vector E and magnetic field vector B, have the same frequency.

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Q. Assertion In an electromagnetic waves, the direction of the magnetic field induction $B$ is parallel to the electric field $E$.
Reason Electric field vector $E$ and magnetic field vector $B$, have the same frequency.

Electromagnetic Waves

Solution:

In an electromagnetic wave, the direction of $B \perp E$.