A bimetallic strip consists of brass and iron when it is heated it bends into an arc with brass on the convex and iron on the concave side of the arc. This happens, because

Options

A. brass has a higher specific heat capacity than Iron
B. density of brass Is more than that of Iron
C. It Is easier to bend an iron strip than a brass strip of the same size
D. brass has a higher coefficient of linear expansion than Iron

Answer

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

### Step 1: Understand the concept of a bimetallic strip
A bimetallic strip consists of two different metals bonded together. When heated, these metals expand at different rates due to their differing coefficients of linear expansion.

**Hint:** Remember that different materials expand differently when heated.

### Step 2: Identify the metals and their properties
In this case, we have brass and iron. Each metal has a specific coefficient of linear expansion, denoted as α (alpha). Let's denote the coefficient for brass as α₁ and for iron as α₂.

**Hint:** Coefficient of linear expansion indicates how much a material expands per degree of temperature change.

### Step 3: Compare the coefficients of linear expansion
Brass has a higher coefficient of linear expansion (α₁) compared to iron (α₂). This means that when both metals are heated, brass will expand more than iron.

**Hint:** The metal with the higher coefficient will expand more when subjected to the same temperature increase.

### Step 4: Analyze the bending of the strip
When the bimetallic strip is heated, the greater expansion of brass causes it to bend outward (convex side), while the lesser expansion of iron causes it to bend inward (concave side). Thus, the strip bends into an arc with brass on the convex side and iron on the concave side.

**Hint:** Visualize how unequal expansion leads to bending in one direction.

### Step 5: Conclude the reason for bending
The bending occurs because brass has a higher coefficient of linear expansion than iron. Therefore, as the temperature increases, brass expands more significantly than iron, leading to the observed curvature of the strip.

**Hint:** The key takeaway is the relationship between thermal expansion and material properties.

### Final Answer
The bimetallic strip bends into an arc with brass on the convex side and iron on the concave side because **brass has a higher coefficient of linear expansion than iron**.