At equator value of angle of dip is zero because on equator:

Options

A. value of V is zero
B. value of H is zero
C. value of V and H zero
D. V and H are equal

Explanation

To understand why the angle of dip is zero at the equator, we can break down the explanation step by step.

### Step-by-Step Solution:

1. **Understanding the Angle of Dip**:
The angle of dip (also known as magnetic inclination) is the angle made by the Earth's magnetic field lines with the horizontal plane. It is denoted by the symbol \( \theta \).

2. **Magnetic Field Components**:
The Earth's magnetic field can be resolved into two components:
- \( B_v \): The vertical component of the magnetic field.
- \( B_h \): The horizontal component of the magnetic field.

3. **Angle of Dip Formula**:
The angle of dip \( \theta \) can be expressed mathematically as:
\[ \tan(\theta) = \frac{B_v}{B_h} \]
This means that the tangent of the angle of dip is the ratio of the vertical component to the horizontal component of the magnetic field.

4. **Condition at the Equator**:
At the equator, the magnetic field lines are parallel to the Earth's surface. This means that there is no vertical component of the magnetic field:
\[ B_v = 0 \]
Therefore, the angle of dip becomes:
\[ \tan(\theta) = \frac{0}{B_h} = 0 \]

5. **Conclusion**:
Since \( \tan(\theta) = 0 \), it follows that:
\[ \theta = 0^\circ \]
Hence, the angle of dip is zero at the equator.

### Final Answer:
At the equator, the value of the angle of dip is zero because the vertical component of the Earth's magnetic field is zero, resulting in no inclination of the magnetic field lines with respect to the horizontal plane.

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