An electromagnetic wave travelling along z-axis is given as E=E0 cos (kz - \(\omega\)t). Choose the correct options from the following.
(a) The associated magnetic field is given as \(B=\frac1c\widehat k\times E=\frac{1}{\omega}(\widehat k\times E)\)
(b) The electromagnetic field can be written in terms of the associated magnetic field as \(E=c(B\times\widehat k)\)
(c) \(\widehat k.E=0,\widehat k.B=0\)
(d) \(\widehat k\times E=0,\widehat k\times B=0\)
1. (a, b, c)
2. (a, c, d)
3. (b, c, d)
4. (b, d)
