Earth’s Magnetic Field
Physics ⇒ Earth and Space Physics
Earth’s Magnetic Field starts at 8 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Earth’s Magnetic Field.
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See sample questions for grade 11
A student measures the magnetic declination at their location to be 10° east. What does this mean?
Calculate the force on a proton (charge = 1.6 × 10-19 C) moving at 2 × 106 m/s perpendicular to the Earth's magnetic field of 5 × 10-5 T.
Describe one way in which animals use the Earth's magnetic field for navigation.
Describe the dynamo effect in the context of Earth's magnetic field.
Describe what is meant by 'magnetic inclination' or 'dip'.
Explain how paleomagnetism provides evidence for plate tectonics.
Explain why the Earth’s magnetic field is often compared to that of a bar magnet.
Explain why the magnetic field strength is generally stronger at the poles than at the equator.
If a charged particle moves parallel to the Earth's magnetic field, what is the force acting on it due to the field?
If the Earth's magnetic field were to disappear, what would be one major consequence for life on Earth?
State one reason why the Earth's magnetic field is not perfectly aligned with its rotational axis.
What is the function of the Earth's magnetosphere?
A cosmic ray proton enters the Earth's magnetic field at a location where the field strength is 4 × 10-5 T. If the proton's velocity is 3 × 107 m/s and is perpendicular to the field, calculate the radius of the circular path it will follow. (Proton mass = 1.67 × 10-27 kg, charge = 1.6 × 10-19 C)
A satellite in low Earth orbit passes through the South Atlantic Anomaly, a region where the Earth's magnetic field is significantly weaker. Explain the potential risks this poses to the satellite and its instruments.
Describe how the inclination (dip) angle of the Earth's magnetic field changes as you move from the magnetic equator to the magnetic poles.
Explain how the movement of charged particles in the Earth's outer core leads to the generation of the planet's magnetic field, referencing the principles of electromagnetism.
Explain why the Earth's magnetic field is not a perfect dipole and describe at least one observed deviation from the dipole model.
