Electromagnetic waves: The magnitude of the electric field at a point P for a certain electromagnetic wave is 570 N/C. What is the magnitude of the magnetic field for that wave at P? (c = 3.0 × 10⁸ m/s) A) 2.91 µT B) 1.90 µT C) 1.10 µT D) 1.41 µT E) 2.41 µT

Question

Quizplus · Accepted Answer

The magnitude of the electric field (E) and the magnitude of the magnetic field (B) in an electromagnetic wave are related by the equation:

E/B = c

where c is the speed of light.

Therefore,

B = E/c = 570 N/C / 3.0 × 10^8 m/s = 1.90 µT

Thus, the answer is B.

Electromagnetic Waves: the Magnitude of the Electric Field at a Point