If a bimetallic strip is heated it will

Options

A. bend towards the metal with lower thermal expansion coefficient
B. bend towards the metal with higher thermal expansion coefficient
C. twist itself into a helix
D. have no bending

Explanation

To solve the question regarding the behavior of a bimetallic strip when heated, we can follow these steps:

### Step 1: Understand what a bimetallic strip is
A bimetallic strip consists of two different metals bonded together. Each metal has a different coefficient of thermal expansion, which means they expand at different rates when heated.

**Hint:** Remember that the coefficient of thermal expansion is a measure of how much a material expands per degree of temperature increase.

### Step 2: Identify the effect of heating on the metals
When the bimetallic strip is heated, the metal with the higher coefficient of thermal expansion will expand more than the metal with the lower coefficient. This difference in expansion causes the strip to bend.

**Hint:** Think about how two different materials respond to the same temperature change; one will stretch more than the other.

### Step 3: Determine the direction of bending
Since the metal with the higher thermal expansion coefficient expands more, the strip will bend towards the metal with the lower thermal expansion coefficient. This is because the metal that expands less will resist the bending caused by the other metal.

**Hint:** Visualize the bending: if one side expands more than the other, which way will the strip curve?

### Step 4: Conclusion
Therefore, when a bimetallic strip is heated, it bends towards the metal with the lower thermal expansion coefficient.

**Final Answer:** The bimetallic strip will bend towards the metal with the lower thermal expansion coefficient.