An electromagnetic wave with frequency `omega` and wavelength `lambda` travels in the + y direction. Its magnetic field is along + xaxis. The vector equation for the associated electric field (of amplitude `E_(0)`) is

Options

A. `vecE=-E_(0)cos(omegat+(2pi)/(lambda)y)z`
B. `vecE=E_(0)cos(omegat-(2pi)/(lambda)y)hati`
C. `vecE=E_(0)cos(omegat-(2pi)/(lambda)y)hatz`
D. `vecE=-E_(0)cos(omegat+(2pi)/(lambda)y)hatz`

Answer

C

Explanation

In an electromagnetic wave electric field and magnetic field are perpendicular to the direction of propagation of wave. The vector equation for the electric field is
`vecE=E_(0)cos(omegat-(2pi)/(lambda)y)hatz`