Earth’s Magnetism
Physics ⇒ Electricity and Magnetism
Earth’s Magnetism starts at 9 and continues till grade 12.
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See sample questions for grade 11
A compass is taken to a place where the angle of dip is 0°. In which direction will the compass needle point?
Define magnetic declination.
Describe the difference between the geographic and magnetic poles of the Earth.
Explain the significance of the horizontal component of the Earth’s magnetic field for navigation.
Explain why the magnetic field inside the Earth is believed to be due to the movement of molten iron in the outer core.
If the angle of dip at a place is 90°, what can you say about the location?
State the dynamo theory of the origin of Earth’s magnetic field.
The horizontal component of the Earth’s magnetic field at a place is zero. What is the angle of dip at that place?
What is the angle of dip at the magnetic equator?
What is the approximate value of the Earth’s magnetic field at the surface?
Describe how paleomagnetism provides evidence for the movement of tectonic plates and the history of Earth's magnetic field reversals.
Explain why the Earth's magnetic field is not perfectly aligned with its rotational axis, and discuss the implications of this misalignment for navigation and mapping.
