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