A cylindrical glass rod is heated with a torch until it conducts enough current to cause a light bulb to glow. The rod has a length, a diameter, and its ends, plated with material of infinite conductivity, are connected to the rest of the circuit. When red hot, the rod's conductivity varies with position measured from the center of the rod as, with go = 4 x 10-2 (22 m).
1) What is the resistance of the glass rod?
2) When a voltage AV is applied between the two ends, what is the current density j?
3) What is the steady-state magnitude of the electric field E (1)?
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