Which of the following is not showing the essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding?

Options

A. Electrostatic field lines can end on charges and conductors have free charges.
B. Magnetic field lines can end but conductors cannot end them.
C. Lines of magnetic field cannot end on any material and perfect shielding is not possible.
D. Shells of high permeability materials can be used to divert lines of magnetic field from the interior region.

Explanation

To solve the question, we need to analyze the statements provided and determine which one does not illustrate the essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding.

### Step-by-Step Solution:

1. **Understanding Electrostatic Shielding**:
- Electrostatic shielding occurs when a conductor is placed in an electric field. The free charges within the conductor rearrange themselves to cancel the electric field inside the conductor, creating a region of zero electric field.

2. **Understanding Magnetostatic Shielding**:
- Magnetostatic shielding is different because magnetic field lines do not start or end on charges. Instead, they form closed loops. Therefore, even if a conductor is placed in a magnetic field, it cannot completely shield the interior from the magnetic field.

3. **Analyzing the Statements**:
- **Statement 1**: "Electrostatic field lines can end on charges and conductors have free charges."
- This statement is true and highlights a difference because electrostatic field lines can terminate on charges.
- **Statement 2**: "Magnetic field lines can end but conductors cannot end them."
- This statement is false because magnetic field lines do not end; they always form closed loops. Thus, this statement does not correctly show the difference.
- **Statement 3**: "Perfect shielding is not possible."
- This statement is true for magnetostatic shielding, as magnetic field lines can penetrate materials to some extent.
- **Statement 4**: "Shells of high permeability can be used to divert lines of magnetic field from the interior region."
- This statement is also true, as materials with high permeability can redirect magnetic field lines, but they cannot completely shield against them.

4. **Conclusion**:
- The statement that does not show the essential difference between electrostatic shielding and magnetostatic shielding is **Statement 2**: "Magnetic field lines can end but conductors cannot end them." This is incorrect regarding the nature of magnetic field lines.

### Final Answer:
The statement that is not showing the essential difference is **Statement 2**.

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