# An EM wave has amplitude of electric field Eo and amplitude of magnetic field is Bo. The electric field at some instant becomes 3/4 Eo. What will be the magnetic field at this instant. (Wave is travelling in vacuum.)

The  electric and  magnetic  field  in a plane  electromagnetic  wave  are  given  by .

According  to given  problem

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Bo= Eo/c where c is spd of light .
now substituting Eo as 3/4Eo and c as 3 10^8, we solve for Bo.

hence Bo= 3Eo/4c
since c= 310^8
we get, Bo = 3Eo /410^-8
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