Question

A plane electromagnetic wave is propagating along the direction (i + j)/√2, with its polarization along the direction k. The correct form of the magnetic field of the wave would be (here B₀ is an appropriate constant) : 

Answer 1

Answer is (1) 

EM wave is in direction → (i + j)/√2

Electric field is in direction → k 

vector(E x B) → direction of propagation of EM wave

Answer 2

Answer is 

Direction of polarisation = E = k 

Direction of polarisation = E x B = (i + j)/√2