The magnetic field component of the electromagnetic wave is 15.0 μT. What is the magnetic energy density of the wave? A) 2.26 × 10^-4 J/m³ B) 8.95 × 10^-5 J/m² C) 1.79 × 10^-4 J/m³ D) 4.47 × 10^-4 J/m² E) 9.72 × 10^-5 J/m³

Question

Quizplus · Accepted Answer

The magnetic energy density (u) of an electromagnetic wave is given by

u = 0.5 * B^2 / μ0

where B is the magnetic field strength and μ0 is the permeability of free space.

Plugging in the values given, we get

u = 0.5 * (15.0 μT)^2 / (4π × 10^-7 T·m/A)

u = 1.79 × 10^-4 J/m^3

So the correct answer is (C).

The Magnetic Field Component of the Electromagnetic Wave Is 15