Electromagnetic Waves: the Magnitude of the Magnetic Field at Point

Multiple Choice

Electromagnetic waves: The magnitude of the magnetic field at point P for a certain electromagnetic wave is 2.12 μT. What is the magnitude of the electric field for that wave at P? (c = 3.0 × 10⁸ m/s)

A) 636 N/C
B) 745 N/C
C) 5.23 µN/C
D) 6.36 µN/C
E) 7.45 µN/C