An electromagnetic wave with frequency ω and wavelength λ travels in the +y direction. Its magnetic field is along -x axis. The vector equation for the associated electric field (of amplitude 
) is
Text Solution
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Given:
Wave travels in +y direction 
direction of propagation 
Magnetic field is along -x direction 
Now, for an electromagnetic wave:
, and direction of propagation are mutually perpendicular, and 
gives propagation direction.
We need 
.
Let's check direction:
So, the electric field is along 
direction.
The general wave equation (for propagation along +y) is:
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