Question

Solve the numerical problem.

The amplitude of the magnetic field part of a harmonic EM wave in a vacuum is B₀ = 5 × 10⁻⁷ T. What is the amplitude of the electric field part of the wave?

Answer 1

Given: B₀ = 5 × 10^–7 T, c = 3 × 10⁸

To find: Amplitude of electric field (E₀)

Formula: c = `"E"_0/"B"_0`

Calculation: From formula,

E₀ = c × B₀

= 3 × 10⁸ × 5 × 10⁻⁷

= 150 V/m

The amplitude of the electric field is 150 V/m.