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 10
Define magnetic declination.
Describe what would happen if the Earth’s magnetic field disappeared suddenly.
Explain what is meant by the term ‘magnetic meridian’.
Explain why the magnetic declination varies from place to place on the Earth.
If the angle of dip at a place is 90°, where is this place located?
Name the three elements of the Earth’s magnetic field.
State one reason why the Earth’s magnetic field is important for life on Earth.
The horizontal component of the Earth’s magnetic field is maximum at which location?
What is the approximate value of the Earth’s magnetic field near the surface?
What is the name of the imaginary line joining the magnetic north and south poles of the Earth?
What is the significance of the horizontal component of the Earth’s magnetic field?
What is the value of the angle of dip at the magnetic equator?
A magnetic needle is placed at a location where the horizontal component of the Earth's magnetic field is zero. What will be the orientation of the needle? Explain your answer.
A scientist measures the angle of dip at two different locations: Location A has an angle of dip of 0°, and Location B has an angle of dip of 90°. What can you infer about the positions of these two locations on Earth?
Describe how the Earth’s magnetic field protects living organisms from harmful solar radiation.
Explain why the geographic north pole of the Earth corresponds to the magnetic south pole.
Explain why the magnetic poles of the Earth do not coincide with the geographic poles.
A compass is taken from the equator to the magnetic pole. Describe and explain the changes observed in the behavior of the compass needle.
A geologist finds a rock sample whose magnetic minerals are aligned at an angle of 45° to the current direction of the Earth's magnetic field at that location. What does this suggest about the Earth's magnetic field in the past?
Describe how paleomagnetism provides evidence for continental drift and plate tectonics.
