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11. A cylindrical tube of uniform cross-sectional area A is fitted with two air tight frictionless pistons. The pistons are connected to each other by a metallic wire. Initially the pressure of the gas is

P0 and temperature is T0, atmospheric pressure is also P0. Now the temperature of the gas is increased to 2T0, the tension in the wire will be

(a)  2P0 A                                         (b) P0 A

(c)  (P0 A) /2                                   (d) 4P0 A

Answer-b

(13)

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