The electric and magnetic fields at a point due to two independent sources are E1 = E(αî + βĵ), B1 = Bk̂ and E2 = Eî, B2 = -2Bk̂, where α, β, E and B are constants. If the Poynting vector is along î + ĵ, then
1
α + β + 1 = 0
2
α + β -1 = 0
3
α + β + 2 = 0
4
α + β - 2 = 0