An EM wave has amplitude of electric field Eo and amplitude of magnetic field is Bo The electric field - Physics - Electromagnetic Waves

Question

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 )

Zafar · Accepted Answer

The electric and magnetic field in a plane electromagnetic wave are
given by
E = Eo  sin w  (t - xc )  
(1)and  B = Bo   sin w  (t - xc ) 
(2)
According to given problem E= 34 Eo
⇒  34 Eo  = Eo  sin w  (t -xc )        [   using eq  (1)     ]      ⇒  sin w  (t -xc ) = 34 B = Bo × 34     ⇒  B = 3  Bo 4         [   using eq  (2)     ]⇒  34 Eo  = Eo  sin w  (t -xc )        [   using eq  (1)     ]      ⇒  sin w  (t -xc ) = 34 B = Bo × 34     ⇒  B = 3  Bo 4         [   using eq  (2)     ]

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.)

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