A plane electromagnetic wave in vacuum travels along

PHYSICS · Multi-part · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Electromagnetic waves and their propagation · Electromagnetic waves and their propagation

Electricity, Magnetism and Electromagnetism, Ch Plane electromagnetic waves: polarisation, energy flux and radiation pressure

Problem

A plane electromagnetic wave in vacuum travels along +z^+\hat{\mathbf{z}}. Its electric field is E=E0cos⁡(kz−ωt) x^\mathbf{E} = E_0\cos(kz - \omega t)\,\hat{\mathbf{x}} with E0=480 V m−1E_0 = 480\,\mathrm{V\,m^{-1}}. Take c=3.00×108 m s−1c = 3.00\times10^{8}\,\mathrm{m\,s^{-1}}. ((a)) Find the amplitude B0B_0 of the magnetic field. ((b)) State the direction along which B\mathbf{B} points at an instant when E\mathbf{E} points along +x^+\hat{\mathbf{x}}.

Browse the problem library