Two parallel wires of radius a = 0.1mm and length 2cm separated by a distance d =1mm connect two elements on the motherboard of a computer. the wires are assumed to be made of perfect electric conductors and reside in a lossless medium with permittivity 0 ε = 2ε and permeability μ0 . a) consider two signals: one of frequency 1 ghz and the other of frequency 20 ghz. do we have to consider the two wires as a transmission line for the first signal? do we have to consider the two wires as a transmission line for the second signal?

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 m up the incline? at what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 0.69 m/s and (c) 2.2 m/s?

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

Write down two additional questions about earth's magnetic field that will make your presentation more informative.