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Electric and magnetic fields in many materials can be analyzed using the relationships for these fields in vacuum, but substituting relative
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Step 1: First, we need to understand that the speed of an electromagnetic wave in a material is given by $v = \frac{1}{\sqrt{\mu \epsilon}}$, where $\mu$ and $\epsilon$ are the permeability and permittivity of the medium, respectively. Show more…
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Electric and magnetic fields in many materials can be analyzed using the same relationships as for fields in vacuum, only substituting relative values of the permittivity and the permeability, $\epsilon=\kappa \epsilon_{0}$ and $\mu=\kappa_{\mathrm{m}} \mu_{0},$ for their vacuum values, where $\kappa$ is the dielectric constant and $\kappa_{\mathrm{m}}$ the relative permeability of the material. Calculate the ratio of the speed of electromagnetic waves in vacuum to their speed in such a material.
The electric field near the Earth's surface has a magnitude of $150 . \mathrm{N} / \mathrm{C}$ and the magnitude of the Earth's magnetic field near the surface is typically $50.0 \mu \mathrm{T}$. Calculate and compare the energy densities associated with these two fields. Assume that the electric and magnetic properties of air are essentially those of a vacuum.
Changing electric fields create changing magnetic fields. These oscillating fields propagate at the speed of light. Describe the orientation (directions) of the fields and the velocity of the electromagnetic wave. SSM
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