What is the magnetic field amplitude of an electromagnetic w

What is the magnetic field amplitude of an electromagnetic wave whose electric field amplitude is 9 0 V/m ? Express your answer to two significant figures and include the appropriate units.

Solution

Speed of light

c=3*10⁸ m/s

Magnetic field amplitude

B_max=E_max/c =9/(3*10⁸)

B_max=3*10^-8 T