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If the electric field component of an el...

If the electric field component of an electromagnetic wave moving in positive x direction is given by `vec E = 6 cos[1.2x - 3.6 * 10^8 t] hat j N/C`then the equation of magnetic field of the electromagnetic wave will be

A

`vec B = 2 * 10^(-8) cos(1.2x + 3.6 * 10^8t)T hat k`

B

`vec B = 2 * 10^(-8) cos(1.2x - 3.6 * 10^8t)T hat k`

C

`vec B = 2 * 10^7 cos(1.2x + 3.6 * 10^8t)T hat i`

D

`vec B = 2 * 10^7 cos(1.2x - 3.6 * 10^8t)T hat i`

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