Earth’s Magnetic Field
Physics ⇒ Earth and Space Physics
Earth’s Magnetic Field starts at 8 and continues till grade 12.
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See sample questions for grade 10
A student observes that a compass needle points towards the north. Explain why this happens in terms of Earth's magnetism.
Describe the dynamo effect in the context of Earth's magnetic field.
Describe what is meant by the term 'magnetic inclination' or 'dip'.
Explain how Earth's magnetic field helps in animal migration.
Explain why a freely suspended bar magnet always points in the north-south direction.
Explain why compasses do not work properly near the magnetic poles.
If a compass needle points 10° west of true north at a certain location, what is the magnetic declination there?
If the magnetic declination at a place is 5° east, what does it mean?
Name the instrument used to detect the direction of Earth's magnetic field.
State one reason why the study of paleomagnetism is important in understanding Earth's history.
What is the approximate inclination (dip) of Earth's magnetic field at the magnetic equator?
What is the main cause of Earth's magnetic field?
What is the main component of the Earth's outer core that contributes to the generation of the magnetic field?
A scientist measures the angle of dip at two locations: Location A has a dip of 60°, and Location B has a dip of 10°. Which location is closer to the magnetic pole? Explain your reasoning.
Describe how the process of magnetic field reversal (geomagnetic reversal) is recorded in the oceanic crust, and explain its significance for the theory of plate tectonics.
Explain how the movement of molten iron in the Earth's outer core generates a magnetic field, referring to the principles of electromagnetism.
The Earth's magnetic field can be approximated as a dipole field. Write the mathematical expression for the magnetic field strength (B) at a point on the magnetic equator at a distance r from the center of the Earth, and explain each term.
A proton is moving parallel to the Earth's surface at the magnetic equator. Describe the direction of the force acting on the proton due to Earth's magnetic field, and explain your reasoning using the right-hand rule.
A research station is located at a latitude where the magnetic inclination is 45°. If the horizontal component of Earth's magnetic field at this location is 25 μT, calculate the total magnetic field strength at the station.
Explain why the Earth's magnetic field is not perfectly symmetrical and describe two factors that can cause local variations in the field.
