Hair of shaving brush cling together when it is removed from water due to

Options

A. force of attraction between hair
B. surface tension
C. viscosity of water
D. characteristic property of hair

Explanation

To solve the question about why the hair of a shaving brush clings together when it is removed from water, we can analyze the situation using the concept of surface tension.

### Step-by-Step Solution:

1. **Understanding Surface Tension**:
- Surface tension is a property of liquids that causes the surface to behave like a stretched elastic membrane. It arises due to the cohesive forces between liquid molecules.

2. **Behavior of Water on the Brush**:
- When the shaving brush is submerged in water, the water molecules exert cohesive forces on each other, which creates surface tension at the interface of the water and air.

3. **Withdrawal of the Brush**:
- As the brush is pulled out of the water, the water forms a meniscus around the bristles due to surface tension. The water tries to minimize its surface area, which causes the bristles to be pulled together.

4. **Clinging of the Bristles**:
- The cohesive forces between the water molecules and the adhesive forces between the water and the bristles cause the bristles to stick together. This results in the hair of the shaving brush clinging together.

5. **Conclusion**:
- Therefore, the hair of the shaving brush clings together when it is removed from water due to the effect of surface tension, which minimizes the surface area of the water and pulls the bristles closer together.

### Final Answer:
The hair of the shaving brush clings together when it is removed from water due to surface tension.

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