A source V₁ = 60 /_0° with internal impedance 200 ohm is connected to a resistive load Zl1=200 ohm by a two-wire lossless transmission line in air (velocity of propagation c = 3 x 10^8 m/s) of length l₁ = 10 cm and characteristic impedance Zo1 = 50 ohm . This load is connected to another load Zl2 by the two-wire transmission line of length L₂=5 cm. Let the load Zl₂ be replaced by a short-circuit. Determine the current Igs for two values of frequency (f):

a. f = 60 Hz. This is the frequency of the house current.Hint: For very small values of ßl, tan ßl may be approximated by zero.

b. f = 1.5 GHz.