The magnetic moment of a length 10 cm amd pole strenth 4.0 Am will be

Answer

To find the magnetic moment (M) of a magnet given its length and pole strength, we can use the formula:

\[ M = m \times L \]

where:
- \( M \) is the magnetic moment,
- \( m \) is the pole strength,
- \( L \) is the length of the magnet.

### Step-by-Step Solution:

1. **Identify the given values**:
- Length of the magnet, \( L = 10 \, \text{cm} \)
- Pole strength, \( m = 4.0 \, \text{A m} \)

2. **Convert the length from centimeters to meters**:
\[ L = 10 \, \text{cm} = \frac{10}{100} \, \text{m} = 0.1 \, \text{m} \]

3. **Substitute the values into the formula**:
\[ M = m \times L = 4.0 \, \text{A m} \times 0.1 \, \text{m} \]

4. **Calculate the magnetic moment**:
\[ M = 4.0 \times 0.1 = 0.4 \, \text{A m}^2 \]

5. **Final Result**:
The magnetic moment \( M \) is \( 0.4 \, \text{A m}^2 \).