Exercise 1 A half-wavelength antenna is made of copper wire with conductivity a = 5.7 x 107 Sm . The antenna is 3 mm thick and 1.5 m long: (a) Calculate the skin depth of the material at the given frequency, the impedance of the antenna and its efficiency when radiating in free space. (b) In an attempt to reduce the impedance and increase efficiency, the antenna is made of a copper tube, 12 mm in diameter. What is the efficiency of the antenna? Assume current flows entirely within one skin depth, on the surface of the tube.

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Coulomb’s Law

Coulomb's law states that the attraction or repulsion force between two charged things is proportional to the product of their charges and inversely proportional to the square of their distance. It has an effect along the line that connects the two-point charges.