Megnetisam
ICSE · Class 9 · Physics
Flashcards for Megnetisam — ICSE Class 9 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allWhat is lodestone and why is it historically important?
Answer
Lodestone is a naturally occurring magnet made of iron oxide (Fe₃O₄) found in Magnesia, Asia Minor. It was the first known magnet with two key properties: (1) it attracts iron pieces, and (2) it align…
Define induced magnetism and explain when it occurs.
Answer
Induced magnetism is the temporary magnetism acquired by a magnetic material when it is kept near or in contact with a magnet. The magnetic material behaves like a magnet only as long as it remains ne…
Explain the principle 'induction precedes attraction' with an example.
Answer
When an ordinary iron piece is brought near a magnet, the iron piece first becomes magnetized by induction (the near end acquires opposite polarity), and then it gets attracted. The attraction happens…
What is a magnetic field and how is its direction determined?
Answer
A magnetic field is the space around a magnet where a compass needle is influenced and rests in a direction other than the geographic north-south direction. It is a vector quantity. The direction of m…
Define magnetic field lines and state their key properties.
Answer
Magnetic field lines are continuous curves in a magnetic field such that the tangent at any point gives the direction of magnetic field at that point. Key properties: (1) They are closed and continuou…
List four evidences that prove Earth has a magnetic field.
Answer
Four evidences of Earth's magnetic field: (1) A freely suspended magnetic needle always rests in geographic north-south direction, (2) An iron rod buried along north-south direction becomes a magnet, …
What are neutral points and where are they located for a magnet placed north-south?
Answer
Neutral points are locations where the magnetic field of a magnet equals Earth's horizontal magnetic field in magnitude but opposite in direction, making the net magnetic field zero. When a magnet's n…
Where are Earth's magnetic poles located and how do they relate to geographic poles?
Answer
Earth's magnetic poles don't coincide with geographic poles. Earth's magnetic south pole is in Canada (70-75° north latitude, 96° west longitude), about 2240 km from the geographic north pole. Earth's…
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