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  4. Light wave is travelling along y -direction. If the corresponding E vector at any time is along the x -axis, the direction of B vector at that time is along :

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Q. Light wave is travelling along $ y $ -direction. If the corresponding $ \overrightarrow{E} $ vector at any time is along the $ x $ -axis, the direction of $ \overrightarrow{B} $ vector at that time is along :Physics Question Image

UPSEEUPSEE 2005

Solution:

The given wave is an electromagnetic wave. Electromagnetic radiation is a self propagating wave in space with electric and magnetic components. These components oscillate at right angles to each other and to the direction of propagation.
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Hence, $\vec{ B }$ is along the $z$ -axis at that time