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In the arrangement $1$ and $2$ , as in the figure, pins $P$ and $Q$ are fixed to a metal loop and an iron rod with the help of wax. In which case are both pins likely to fall at different times?

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A

B

Both of the above

None of the above

answer is B.

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Detailed Solution

Both of the pins are likely to fall at different times in case

B

.
In case

A

P

and

Q

got equal heat, so pin fix at

P

and

Q

fall simultaneously. But in case

B

, the pin at point

P

falls first, then pin

Q

falls next because heat received at

P

is greater than at

Q

. In this process, heat is transferred by conduction.

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