For plane electromagnetic waves propagating in the z-direction , which one of the following combinations gives the correct possible direction for `vecE and vecB` field respectively ?

Options

A. `hati + 2 hatj and 2 hati - hatj `
B. ` - 2 hati - 3hatj and 3 hati - 2hatj`
C. `2 hati + 3hatj and hati + 2hatj `
D. `3hati +4 hatj and 4 hati - 3 hatj`

Answer

B

Explanation

The cross prodcut of ` vecE and vecB ` must be in the direction of +z - axis and dot product of ` vecE and vecB ` must be zero
` (vecE xx vecB )/( | vecE xx vecB |)`
option ` vecE . vecB =0`
option (a)
Only option (b) follows the condition