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A 500 Omega resistor connected to an ext...

A `500 Omega` resistor connected to an external battery is placed inside a thermally insulated cylinder fitted with a frictionless pistion. The cylinder contains an ideal gas. A current i of 200mA flows through the resistor as shown in the figure. The mass of the piston is 10kg. Assuming `g = 10m//s^(2)`, the speed at which the piston will move upward, due to heat dissipated by the resistor, so that the temperature of the gas remains unchanged is

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