At magnetic north pole of the earth the values of horizontal component H arıd angle of dip are :

Options

A. H=0 and`f=45^@`
B. H=0 and`f=90^@`
C. H=0 and`f=0^@`
D. H=45 and`f=45^@`

Answer

To solve the problem regarding the values of the horizontal component (H) and the angle of dip at the magnetic north pole of the Earth, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Magnetic North Pole**:
- At the magnetic north pole, the Earth's magnetic field lines are directed vertically downwards. This means that the horizontal component of the magnetic field is zero.

2. **Defining the Horizontal Component (H)**:
- The horizontal component (H) of the Earth's magnetic field is the component that runs parallel to the Earth's surface. At the magnetic north pole, since the magnetic field lines are vertical, H = 0.

3. **Understanding the Angle of Dip**:
- The angle of dip (also known as magnetic inclination) is the angle made by the Earth's magnetic field with the horizontal plane. At the magnetic north pole, the magnetic field is directed straight down, which means the angle of dip is 90 degrees.

4. **Summarizing the Conditions**:
- At the magnetic north pole:
- Horizontal component (H) = 0
- Angle of dip = 90 degrees

5. **Checking the Options**:
- We need to analyze the given options to find which one satisfies both conditions:
- **Option 1**: Horizontal component = 0, Angle of dip = 0 degrees (Incorrect)
- **Option 2**: Horizontal component = 0, Angle of dip = 90 degrees (Correct)
- **Option 3**: Horizontal component = 0, Angle of dip = 0 degrees (Incorrect)
- **Option 4**: Horizontal component ≠ 0 (Incorrect)

6. **Conclusion**:
- The only option that correctly states that the horizontal component is 0 and the angle of dip is 90 degrees is **Option 2**.

### Final Answer:
The correct values at the magnetic north pole are:
- Horizontal component (H) = 0
- Angle of dip = 90 degrees
- **Correct Option: Option 2**