Q.

An EM wave is propagating in a medium with a velocity v→=vi^. 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

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a

-z direction

b

+z direction

c

-y direction

d

-x direction

answer is B.

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Detailed Solution

Velocity of em wave in a medium is given by E→×B→=v→∴ (E^)×(B→)=v^ [∵E→=Ej^( Given )] As i^=j^×k^, So B→=Bk^Direction of oscillating magnetic field of the em wave will be along +z direction.
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