Strips of two metals A and B are firmly joined together as shown in the figure(Before Heating) On heating, A expands more than B does. If this joined strip is heated, then it will appear as

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Q: 120 (IAS/1999)
Strips of two metals A and B are firmly joined together as shown in the figure(Before Heating) On heating, A expands more than B does. If this joined strip is heated, then it will appear as

question_subject: 

Science

question_exam: 

IAS

stats: 

0,12,6,3,12,2,1

keywords: 

{'heating': [0, 1, 0, 0], 'iv': [6, 110, 77, 8], 'strips': [1, 1, 0, 0], 'strip': [0, 1, 0, 1]}

When two metals are firmly joined and heated, they expand due to the heat. The expansion depends on their coefficients of thermal expansion. Here, metal A expands more than metal B on heating. This means that metal A has a higher coefficient of thermal expansion than metal B.

Option 1 depicts the original strip without any change. This can`t be the answer as we know both metals have expanded.

Option 2 shows bending towards the side of metal B. This is because metal A has expanded more, pushing the strip to bend in the direction of metal B, which has lesser expansion.

Option 3 and 4 show bending towards the side of metal A. This is incorrect as metal A has higher expansion and thus should push the strip towards metal B, not pull it towards itself.

Thus, the correct answer is Option 2 as it accurately illustrates the given situation on heating.