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?
A geophysicist measures the horizontal component (B_H) of the Earth's magnetic field at a location to be 0.18 G and the vertical component (B_V) to be 0.24 G. Calculate the angle of dip at this location.
The Earth's magnetic field at a certain location is given by a horizontal component of 0.20 G and a total intensity of 0.30 G. Calculate the angle of dip at this location, and state whether the location is closer to the magnetic equator or the magnetic pole.
Which instrument is used to measure the angle of dip?
(1) Dip circle
(2) Galvanometer
(3) Electroscope
(4) Voltmeter
Which of the following best describes the Earth’s magnetic field?
(1) It is similar to the field produced by a bar magnet.
(2) It is similar to the field produced by an electric dipole.
(3) It is similar to the field produced by a solenoid.
(4) It is similar to the field produced by a point charge.
Which of the following best explains why a compass needle points north?
(1) It is attracted to the geographic north pole.
(2) It aligns with the Earth’s magnetic field, pointing towards the magnetic north.
(3) It is repelled by the magnetic south pole.
(4) It is affected by gravity.
Which of the following is a correct statement about the Earth’s magnetic field?
(1) It is strongest at the equator.
(2) It is strongest at the poles.
(3) It is zero at the poles.
(4) It is the same everywhere on Earth.
The angle between the geographic meridian and the magnetic meridian at a place is called ________.
The direction in which a freely suspended magnetic needle points is called the ________.
The Earth’s magnetic field protects us from harmful ________ from the Sun.
The process by which the direction of the Earth’s magnetic field reverses over geological time is called ________.
State whether the following statement is true or false: The Earth’s magnetic field is essential for the existence of life on Earth.
State whether the following statement is true or false: The Earth’s magnetic field lines emerge from the magnetic north pole and enter the magnetic south pole.
True or False: The Earth’s magnetic field is static and does not change over time.
True or False: The magnetic equator coincides with the geographic equator.
