The earth's magnetic field always has a vertical component except at the

Options

A. magnetic equator
B. magnetic poles
C. geographic north pole
D. latitude `45^(@)`

Answer

To solve the question regarding the Earth's magnetic field and its vertical component, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Earth's Magnetic Field**: The Earth's magnetic field has both vertical and horizontal components. The vertical component is the part of the magnetic field that points either upwards or downwards relative to the Earth's surface.

2. **Identifying the Angle of Dip**: The angle of dip (or magnetic inclination) is the angle that the Earth's magnetic field makes with the horizontal plane. This angle varies at different locations on Earth.

3. **Location of Zero Vertical Component**: The vertical component of the magnetic field can be expressed mathematically as:
\[ B_v = B \cdot \sin(\theta) \]
where \(B\) is the magnitude of the magnetic field and \(\theta\) is the angle of dip.

4. **Determining the Angle at the Equator**: At the magnetic equator, the angle of dip \(\theta\) is 0 degrees. This means that the magnetic field lines are parallel to the horizontal surface.

5. **Calculating the Vertical Component at the Equator**: Since \(\sin(0^\circ) = 0\), we can substitute this into our equation:
\[ B_v = B \cdot \sin(0^\circ) = B \cdot 0 = 0 \]
Therefore, the vertical component of the Earth's magnetic field is zero at the magnetic equator.

6. **Conclusion**: The Earth's magnetic field always has a vertical component except at the magnetic equator.

### Final Answer:
The Earth's magnetic field always has a vertical component except at the **magnetic equator**.

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