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Physics · PYQ NEET UG 2018
हिन्दीAn em wave is propagating in a medium with a velocity \( \vec{v} = v\hat{i} \). The instantaneous oscillating electric field of this em wave is along \( + \text{Y} \) axis. Then the direction of oscillating magnetic field of the em wave will be along
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Correct answer · Option B
+ Z direction
Explanation
The direction of propagation of an electromagnetic wave is given by the direction of \( \vec{E} \times \vec{B} \). Here, \( \hat{v} = \hat{i} \) and \( \hat{E} = \hat{j} \). Since \( \hat{j} \times \hat{k} = \hat{i} \), the magnetic field must be along the \( + \text{Z} \) direction.
