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Q.

Two pistons can move freely inside a horizontal cylinder having two sections of unequal cross-sections. The
pistons are joined by an inextensible, light string and some gas is enclosed between the pistons. On heating the system, the piston will:

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a

move to the left.

b

move to the right.

c

remain stationary.

d

(a) or (c) depending upon the initial pressure of the gas.

answer is A.

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Detailed Solution

On heating, pressure will increase. But force is PxA,  left  piston has more area so it will exert more force hence moves towards left.

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