A plane electromagnetic wave travelling along the direction has a wavelength of . The variation in the electric field occurs in the direction with an amplitude . The equations for the electric and magnetic fields as a function of and are respectively 

a) 

b) 

c) 

d) 
A plane electromagnetic wave travelling along the direction has a wavelength of . The variation in the electric field occurs in the direction with an amplitude . The equations for the electric and magnetic fields as a function of and are respectively 

a) 

b) 

c) 

d) 
(d) Since electromagnetic wave is of transverse nature. Hence if electric field is along axis, then magnetic field must be in axis. Since propagation is axis. Hence correct option is (d) 