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An EM wave is propagating in a medium wi...

An EM wave is propagating in a medium with a velocity `vecv=vhati` . 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

A

`-y` direction

B

`+z` direction

C

`-z` direction

D

`-x` direction

Text Solution

Verified by Experts

The correct Answer is:
B
The electric field is along +y axis
`therefore vecE=Ehatj`
Now, `vecv=vecExxvecB`
or , `vhati=EhatjxxvecB[because vecv=vhati]`
`therefore vecB=Bhatk`
Hence the magnetic field is along +z direction.
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