Two cylindrical bars, each with diameter of 2.30 cm, are welded together end-to-end. one of the original bars is copper (resistivity 1.72e-8 ohm*m) and is 0.350 m long. the other bar is tungsten (resistivity 5.65e-8 ohm*m) and is 0.155 m long. what is the resistance between the ends of the welded bar at 20 oc
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