The magnetic field in plane electromagnetic wave is given by `=2xx10^(-7)sin (0.5xx10^(3)xx10^(11)t)` This electro magnetic wave is

Options

A. `vecE = -9 sin[200 pi(y - ct)] hatk V//m`
B. `vecE = 9 sin[200 pi(y - ct)] hatk V//m`
C. `vecE = -10^(-6) sin[200 pi(y - ct)] hatk V//m`
D. `vecE = 3 xx 10^(-8) sin[200 pi(y - ct)] hatk V//m`

Answer

A

Explanation

`E=BC `
` E= 3xx 10^(-8) xx 3xx 10^(8)`
` vecS = ( vecE xx vecB )/(r )`

` E= 9 sin [ 200 pi ( Y + ct) (- hatk)]`