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A hollow conducting cylinder has a length L, and inner and outer radii (a and b). It is made of a material with resistivity p. A potential difference is set up between the inner and outer surfaces of the cylinder. Calculate the resistance of the cylinder.
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A certain lightbulb filament when hot has a resistance of 205 ?. The potential difference across the filament at a certain instant is standard household voltage, 120 V. What current is flowing through the bulb at that time
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