Megnetisam — Important Questions
ICSE · Class 9 · Physics
43 important questions from Megnetisam for ICSE Class 9 Physics, with answers. Includes multiple choice, true false and multiple correct questions.
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Important Questions from Megnetisam
Magnetic field lines never intersect each other.
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True
Magnetic field lines never intersect because if they did, there would be two directions of magnetic field at that point, which is impossible.
What happens to iron nails when a magnet is removed from a chain of nails?
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They fall down as magnetism is lost
When the magnet is removed, the induced magnetism in iron nails disappears immediately, causing them to lose attraction and fall down due to gravity.
Where are the neutral points located when a bar magnet's north pole faces geographic north?
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East and West of the magnet
When north pole faces geographic north, the magnet's field is parallel to Earth's field along the axis, so neutral points appear on the sides in east-west direction.
Which of these are properties of electromagnets? (Select all correct answers)
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Can be turned on and off, Strength can be varied, Poles can be reversed
Electromagnets are temporary magnets that can be controlled by electric current. Their strength depends on current, and polarity can be reversed by changing current direction.
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