Решение задачи по физике раздел 25 пункт 52 волны

52. In the medium (ε = 3, μ = 1) extends a plane electromagnetic wave. The amplitude of the magnetic field of the wave of 0.5 A / m. On her way to the propagation direction is perpendicular to the absorbing surface having the shape of a circle of radius 0.1 m. What is the energy absorption of the surface for the time t = 30 s? The period of the T-wave << t.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)