Pranjal performed an experiment which is shown here.
figure

He found that pin 2 fell off first and pin 1 did not fall even after five minutes. Which item can be made of the same materials as the rods A and B?
(a) A-cooking vessel; B handle of a saucepan
(b) A-handle of an electric iron; B base of an electric iron
(c) A-handle of a saucepan; B-coffee mug
(d) A-base of an electric iron; B-handle of an electric iron

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Solution

(b) A-handle of an electric iron; B-base of an electric iron
Pin 1 did not fall because rod A is a bad conductor of heat. Pin 2 fell off first because rod B is a good conductor of heat.

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(b) A-handle of an electric iron; B-base of an electric iron Pin 1 did not fall because rod A is a bad conductor of heat. Pin 2 fell off first because rod B is a good conductor of heat.

(b) A-handle of an electric iron; B-base of an electric iron
Pin 1 did not fall because rod A is a bad conductor of heat. Pin 2 fell off first because rod B is a good conductor of heat.