A bimetallic strip made of aluminium and steel `(alpha_(Al) gt alpha_(steel))` on heating the strip will

Options

A. remain straight
B. get twisted
C. will bend with aluminium on concave side
D. will bend with steel on concave side

Explanation

To solve the problem regarding the behavior of a bimetallic strip made of aluminum and steel when heated, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Bimetallic Strip**:
A bimetallic strip consists of two different metals bonded together. In this case, we have aluminum and steel. Each metal has a different coefficient of linear expansion, denoted as \( \alpha \).

2. **Coefficients of Linear Expansion**:
We know that the coefficient of linear expansion for aluminum (\( \alpha_{Al} \)) is greater than that for steel (\( \alpha_{steel} \)). This means that aluminum will expand more than steel when both are subjected to the same temperature increase.

3. **Heating the Strip**:
When the bimetallic strip is heated, both metals will try to expand. However, since aluminum expands more than steel, the lengths of the two metals will not increase equally.

4. **Resulting Bending**:
Due to the difference in expansion, the strip will bend. The side that expands more (aluminum) will try to elongate more than the side that expands less (steel). This results in the strip bending towards the side of the metal that expands less.

5. **Determining the Concave Side**:
Since aluminum expands more and is on the outer side of the bend, the strip will bend with steel on the concave side. This means that the inner curve of the bend will be on the steel side, while the aluminum will be on the outer curve.

6. **Conclusion**:
Therefore, when the bimetallic strip made of aluminum and steel is heated, it will bend with steel on the concave side.

### Final Answer:
The bimetallic strip will bend with steel on the concave side.

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