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Question

If a bimetallic strip is heated it will


A

Bend towards the metal with higher thermal expansion

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B

Not bend at all

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C

Twist itself into a helix

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D

Bend towards the metal with lower thermal expansion

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Solution

The correct option is D

Bend towards the metal with lower thermal expansion


Explanation for correct option:

Option (D):

  1. We know that metals undergo thermal expansion when their temperature is raised.
  2. A bimetallic strip is a strip that is made up of two types of metals.
  3. Coefficient thermal expansion is a characteristic property of solids that is unique to each type of metal
  4. Hence, the two different types of metal in a bimetallic strip will have two different coefficients of thermal expansion.
  5. Therefore, the metal with a higher thermal expansion rate will expand and bend more than the metal with a lower thermal expansion.
  6. As a result, the bimetallic strip will bend towards the metal with lower thermal expansion.

Explanation for incorrect option:

Option (A):

  1. The metal with a higher thermal expansion rate will expand and bend more than the metal with a lower thermal expansion.
  2. Hence, the bimetallic strip will not bend towards the metal with higher thermal expansion.

Option (B):

  1. We know that metals undergo thermal expansion when their temperature is raised.
  2. Hence, the metals will expand and bend.

Option (C):

  1. Coefficient thermal expansion is a very small quantity due to which the net change in length of the metals is not enough to make complete twists.
  2. Thus, the formation of a helix is not possible.

Hence, option D is the correct answer.


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