Solving a problem in physics, section 62, point 62 wave

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62. Two parallel wires embedded in glycerol, inductively coupled to the generator of electromagnetic vibrations frequency ν = 420 MHz. The distance l between the antinodes of standing waves on wires equal to 7 cm. Find the permittivity ε of glycerol. The magnetic permeability μ accept unity.
Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)