Earth’s Magnetism
Physics ⇒ Electricity and Magnetism
Earth’s Magnetism starts at 9 and continues till grade 12.
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At which location is the vertical component of the Earth’s magnetic field zero?
Define the term 'angle of dip' or 'magnetic inclination'.
Describe the difference between the magnetic meridian and the geographic meridian.
Describe the significance of the magnetic declination for navigation.
Explain why a freely suspended magnet always aligns itself in the north-south direction.
Explain why the geographic and magnetic poles of the Earth do not coincide.
If the angle of dip at a place is 0°, what can you say about the location of that place?
Name the instrument used to measure the angle of dip.
A compass needle placed at the magnetic equator will be:
(1) Vertical
(2) Horizontal
(3) Pointing upward
(4) Not affected by the Earth’s field
At the magnetic poles, the angle of dip is:
(1) 0°
(2) 45°
(3) 90°
(4) 180°
The value of the horizontal component of the Earth’s magnetic field at the magnetic equator is:
(1) Maximum
(2) Minimum
(3) Zero
(4) Equal to the vertical component
Which of the following best describes the Earth’s magnetic field?
(1) It is exactly aligned with the geographic axis.
(2) It is a uniform field with no variation.
(3) It is similar to the field produced by a bar magnet tilted with respect to the Earth’s axis.
(4) It is only present at the equator.
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 lines emerge from the ________ magnetic pole and enter the ________ magnetic pole.
The process by which the Earth’s magnetic field is generated is known as the ________ effect.
State whether the following statement is true or false: The Earth’s magnetic field protects us from harmful solar radiation.
True or False: The Earth’s magnetic field is essential for the functioning of compasses.
True or False: The Earth’s magnetic field reverses its polarity at irregular intervals.
True or False: The magnetic equator coincides with the geographic equator.
