Question

As the earth rotates, the magnetic poles:

• A. stay the same
• B. change a little
• C. switch completely
• D. disappear

Hint:

Earth's magnetic poles slowly drift with time. They do not remain exactly fixed like geographical poles.

Answer 1

The Correct Option is B

Concept:
The Earth behaves like a giant magnet. It has a magnetic north pole and a magnetic south pole. However, Earth's magnetic poles are not exactly fixed at one position. They slowly shift with time due to changes in the Earth's outer core.

Step 1: Understand Earth's magnetic field.
Earth's magnetic field is produced mainly by the movement of molten iron and nickel in the outer core. This movement is not perfectly constant. Therefore, Earth's magnetic field also changes slowly with time.

Step 2: Understand magnetic pole movement.
The geographic poles are related to the Earth's rotation axis. But magnetic poles are related to the Earth's magnetic field. The magnetic poles slowly wander or change their position slightly over time.

Step 3: Check the options.
Option (A) stay the same is incorrect because magnetic poles are not perfectly fixed.
Option (B) change a little is correct because magnetic poles slowly shift.
Option (C) switch completely is not correct for normal daily rotation. Complete reversal happens over geological time scales, not simply due to Earth rotating.
Option (D) disappear is incorrect because magnetic poles do not disappear during normal rotation. Hence, the correct answer is: \[ \boxed{(B)\ \text{change a little}} \]