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 a lodestone?
Answer
A lodestone is a natural magnet. It is an ore of iron oxide, Fe3O4, found in Magnesia, Asia Minor. It attracts small pieces of iron and sets itself in a definite direction when suspended freely.
Why do a freely suspended magnet and a compass needle point north-south?
Answer
Earth behaves like a huge bar magnet at its centre. Its magnetic south pole lies near the geographic north, and its magnetic north pole lies near the geographic south. So a freely suspended magnet ali…
State the law of magnetic poles.
Answer
Two like poles repel each other, while two unlike poles attract each other.
Why does a piece of iron get attracted to a magnet?
Answer
A piece of iron first becomes magnetised by induction. The end nearer the magnet gets opposite polarity, so attraction occurs. Induction precedes attraction.
State the definition of induced magnetism.
Answer
The temporary magnetism acquired by a magnetic material when it is kept near or in contact with a magnet is called induced magnetism.
An unmagnetised iron bar AB is placed near a magnet. What polarities appear at A and B?
Answer
The end nearer the inducing pole gets opposite polarity, and the farther end gets similar polarity. So if A is near the north pole of the magnet, A becomes south and B becomes north.
Why is induced magnetism temporary?
Answer
Induced magnetism lasts only as long as the inducing magnet remains nearby. When the magnet is removed, the magnetic material loses most or all of its magnetism.
A magnet is brought near a chain of iron nails. Why do the nails form a chain?
Answer
The first nail becomes magnetised by induction and attracts the second nail. The second nail also becomes magnetised and attracts the third nail. This continues until the force of attraction balances …
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