An em wave is propagating in a medium with a velocity $\vec{V} = V \hat{i}$ . The instataneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along

-z direction

+z direction

-x direction

-y-direction

Solution

+z direction

As we know,

$\vec{E} x \vec{B} = \vec{V} (E \hat{j}) x (\vec{B}) = V \hat{i}$

(Therefore , electric field vector is along + y axis)

$S o, \vec{B} = B \hat{k}$

i.e., direction of magnetic field vector is along + z direction.

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