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Q.

At STP a rod is hung from a frame as shown in figure, leaving a small gap between the rod and floor. The frame and rod system is heated uniformly upto $350 K$ . Then

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a

If $α_{r o d} < α_{f r a m e}$ , then rod may touch the floor.

b

The rod will never touch the floor in any case.

c

None of the above

d

If $α_{r o d} > α_{f r a m e}$ , then rod may touch the floor.

answer is B.

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Detailed Solution

$α_{r o d} > α_{f r a m e}$ , then rod may touch ground.

At STP a rod is hung from a frame as shown in figure, leaving a small gap between the rod and floor. The frame and rod system is heated uniformly upto 350

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