Question

Look at Figure.

The length of wire PQ in case A is equal to the diameter of the semicircle formed by the wire CDE, in case B. One pin is attached to each wire with the help of wax as shown in the following figure. Which pin will fall first? Explain.

Answer 1

The pin on the wire in case A will fall first as heat will reach it before it reaches the pin in case B (as CDE > PQ). In both the cases, heat is transferred to the pins mainly through conduction.