A plane electromagnetic wave is moving in free space with velocity 
and its electric field is given as 
, where 
is the unit vector along 
-axis. The magnetic field vector 
of the wave is:
Text Solution
Verified by ExpertsC
For an electromagnetic wave, the relationship between electric and magnetic field amplitudes is 
.
Here 
and 
.
So, 
.
The electric field is along the 
direction.
Since the wave travels in the 
direction, the magnetic field direction is determined by 
pointing in the 
direction.
Using the right-hand rule: 
(positive 
direction), confirming the magnetic field is in the 
direction.
Therefore, 
T.
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