In case ‘B’, the pin P will fall before the pin Q because the heat will reach pin P first. In case ‘A’, the heat travels in both the directions, therefore, pins P and Q will fall simultaneously.
1. In which direction would heat flow in the loop? 2. In which order the pins at points P, Q and R fixed with the help of wax fall if points O, P, Q and R are equidistant from each other?
Question
In the arrangements A and B shown in the figure below, pins P and Q are fixed to a metal loop and an iron rod with the help of wax. In which case are both the pins likely to fall at different times? Explain. 
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