Answer: B 0 = 3.33 × 10⁻⁷ T.
- A B<sub>0</sub> = 3.33 × 10⁻⁷ T
- B B<sub>0</sub> = 100 T
- C B<sub>0</sub> = 3 × 10¹⁰ T
- D B<sub>0</sub> = 100/c T
Correct answer: A. B<sub>0</sub> = 3.33 × 10⁻⁷ T
Explanation: B<sub>0</sub> = E<sub>0</sub>/c = 100/(3×10⁸) = 3.33×10⁻⁷ T. The magnetic field amplitude is much smaller than the electric field amplitude in SI units.
In an electromagnetic wave, the oscillating electric field (E) and magnetic field (B) are perpendicular to each other and to the direction the wave travels - a purely transverse wave that needs no medium, unlike sound.
Concept context
Maxwell's equations, EM spectrum, properties, and applications of each band.