EARTH SCIENCE
MAGNETISM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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their magnetic fields increase with size
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the attractive force of the magnetic fields is greatest at the poles
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the attractive force of their magnetic fields is greatest at the center
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electric current causes them to lose magnetism
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Detailed explanation-1: -Earth is similar to a giant bar magnet with magnetic field lines radiating from the south to the north magnetic pole. Charged particles become trapped on these field lines, forming the Earth’s magnetosphere. Magnetic field lines generated by the Earth’s internal magnetic field, and the orientation of the field.
Detailed explanation-2: -The effect of magnetism is the strongest at the ends of a magnet. We call these two ends the poles. Hence the strength of a magnet is maximum at both of its poles.
Detailed explanation-3: -The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole when compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.
Detailed explanation-4: -The magnetic force of attraction is greater where the field lines are crowded. Since all the magnetic fields lines emerge from the poles so the crowd or concentration or density of field lines is maximum near poles.