Lines of force due to earth's horizontal magnetic field are

Options

A. parallel and straight
B. elliptical
C. concentric circles
D. curved lines

Answer

To determine the nature of the lines of force due to Earth's horizontal magnetic field, we can follow these steps:

### Step 1: Understand the Concept of Magnetic Field Lines
Magnetic field lines, or lines of force, represent the direction of the magnetic field. They indicate the path that a north magnetic pole would take if placed in the field.

**Hint:** Remember that magnetic field lines emerge from the north pole and enter the south pole.

### Step 2: Identify Earth's Magnetic Field
Earth has a magnetic field that can be visualized as lines of force. The horizontal component of this field is what we are interested in.

**Hint:** Consider how the Earth's magnetic field is oriented in relation to its surface.

### Step 3: Visualize the Horizontal Magnetic Field
When we visualize the Earth's horizontal magnetic field, we can imagine it as lines that are predominantly horizontal at the surface of the Earth.

**Hint:** Think about how these lines would appear if you were looking down at the Earth from above.

### Step 4: Analyze the Shape of the Field Lines
The lines of force in the horizontal magnetic field are not straight; they curve as they extend from the magnetic poles.

**Hint:** Consider the nature of magnetic fields around a magnet and how they behave in three-dimensional space.

### Step 5: Conclude on the Nature of the Lines
The lines of force due to the Earth's horizontal magnetic field are curved lines. They do not form parallel lines, elliptical shapes, or concentric circles.

**Hint:** Recall that the curvature of the lines indicates the variation in the magnetic field strength and direction.

### Final Answer
The lines of force due to Earth's horizontal magnetic field are **curved lines**.