A square frame of side L is dipped in a soap solution .When it is taken out of the solution . When it is take out of the solution , a film is formed on it . If the surface tension is T, then force acting on it is :

Options

A. 2TL
B. 16TL
C. 4TL
D. 8TL

Explanation

To solve the problem of finding the force acting on a square frame of side L when it is dipped in a soap solution and taken out, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Setup**:
- A square frame with side length \( L \) is dipped in a soap solution.
- When the frame is taken out, a soap film is formed on both sides of each edge of the square frame.

2. **Identifying the Film Formation**:
- Each side of the square frame has a soap film on both its inner and outer surfaces.
- Therefore, for each side of length \( L \), there are two surfaces (inner and outer) contributing to the total force due to surface tension.

3. **Calculating the Force on One Side**:
- The surface tension \( T \) is defined as the force per unit length.
- For one side of the frame, the total length of the film is \( L \), and since there are two surfaces (inner and outer), the effective length for the force calculation is \( 2L \).
- The force \( F \) acting on one side can be expressed as:
\[ F = T \times \text{(effective length)} = T \times 2L \]

4. **Calculating the Total Force on the Frame**:
- Since the square frame has four sides, the total force acting on the entire frame is:
\[ F_{\text{total}} = 4 \times (T \times 2L) = 8TL \]

5. **Final Result**:
- Thus, the total force acting on the square frame when it is taken out of the soap solution is:
\[ F_{\text{total}} = 8TL \]

### Conclusion:
The force acting on the square frame is \( 8TL \).