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3.The shorted coax Imagine a coaxial cable made out of two concentric conductors of radius rı and r2 respec tively. One end of the cable is connected to a battery and the other to a resistor so that the cable forms a whole circuit. We assume that the thickness of the conductor walls is negligible. We note R the resistance of the resistor and V the voltage supplied by the battery. a) Calculate the electric field in the region ri <r < r2 and for r > r2. Express it in terms of the potential supply by the battery, V, and the resistor R. b) Calculate the magnetic field in the same regions.

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