Question

A bimetallic strip is made of metals M1 and M2. On cooling through the same temperature, M1 contracts more than M2. When the strip is heated, it willImmersive Reader
(1 Point)
1-bend towards M1
2-bend towards M2
3-not bend at all
4-the direction of bending cannot be predicted

Answer 1

Answer:

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Answer 2

Answer:  on cooling though the same temperature, M1 contracts more than M2.

i.e., \Delta l_1>\Delta l_2

or, l_0\alpha_1\Delta T > l_0\alpha_2\Delta T

or, \alpha_1 > \alpha_2

hence, thermal expansion of first metal is higher than that of 2nd metal.

we know, strip will bend with the metal of greater coefficient of thermal expansion on outer side i.e., convex side.

so, bimetallic strip will bend towards M2.

hence, option (2) is correct choice.

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