Published by:
CGP EDU Academic Team
Published on: August 13, 2026
A plane electromagnetic wave of frequency 
travels in vacuum along the positive 
-direction. The electric field 
at a particular space point 
and an instant of time 
is 
.
The magnetic field 
at time 
is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
The magnitude of 
is
In EM wave, 
and 
oscillates perpendicular to each other. As wave is propagating along 
-direction and 
is along 
-direction. So, magnetic field 
should be along 
-direction.
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