An em wave is propagating in a medium with a velocity . The instantaneous oscillating electric field of this em wave is along axis. Then the direction of oscillating magnetic field of the em wave will be along [2018]

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Solution

Q.
An 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 $+ y$ axis. Then the direction of oscillating magnetic field of the em wave will be along [2018]

1 $- z$ direction

2 $+ z$ direction

3 $- y$ direction

4 $- x$ direction

Ans.
(2)

Velocity of em wave in a medium is given by $\vec{v} = \vec{E} \times \vec{B}$

$∴$ $v \hat{i} = (E \hat{j}) \times (\vec{B}) [∵ \vec{E} = E \hat{j} (Given)]$

As $\hat{i} = \hat{j} \times \hat{k}, so \vec{B} = B \hat{k}$

Direction of oscillating magnetic field of the em wave will be along $+ z$ direction.

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