In a plane perpendicular to the magnetic meridian, the dip needle will be:

Options

A. verticle
B. inclined equal to the angle of dip at that place
C. horizontal
D. pointing in any direction

Explanation

To solve the question regarding the behavior of a dip needle in a plane perpendicular to the magnetic meridian, we need to understand the concepts of magnetic meridian and magnetic dip.

### Step-by-Step Solution:

1. **Understanding Magnetic Meridian**: The magnetic meridian is a vertical plane that contains the magnetic field lines of the Earth. It is defined by the direction of the magnetic north and south poles.

2. **Defining the Dip Needle**: A dip needle is a magnetized needle that can rotate freely in a vertical plane. It aligns itself with the Earth's magnetic field.

3. **Plane Perpendicular to Magnetic Meridian**: When we say a plane is perpendicular to the magnetic meridian, it means that the plane is oriented in such a way that it does not align with the magnetic field lines of the Earth.

4. **Behavior of the Dip Needle**: In a plane that is perpendicular to the magnetic meridian, the dip needle will not align itself vertically (which is the case when it is in the magnetic meridian). Instead, it will experience a torque due to the magnetic field.

5. **Resulting Position of the Dip Needle**: The dip needle will tend to align itself in the direction of the horizontal component of the Earth's magnetic field. This means that it will point towards the magnetic north but will also dip at an angle relative to the horizontal plane.

6. **Conclusion**: Therefore, in a plane perpendicular to the magnetic meridian, the dip needle will not be vertical but will point towards the magnetic north while dipping at an angle.

### Final Answer:
In a plane perpendicular to the magnetic meridian, the dip needle will point towards the magnetic north but will dip at an angle relative to the horizontal.

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