Electricity and Magnetism
ICSE · Class 7 · Physics
Flashcards for Electricity and Magnetism — ICSE Class 7 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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State the law of magnetism.
Answer
Like poles repel and unlike poles attract. North pole and north pole repel. North pole and south pole attract.
A magnet is suspended freely. In which direction does it come to rest?
Answer
A freely suspended magnet comes to rest in the north-south direction. The end pointing towards the north is called the north pole, and the end pointing towards the south is called the south pole.
Why is repulsion the sure test for a magnet?
Answer
Repulsion happens only when two magnets face each other with like poles. A magnet can also attract a plain iron rod, so attraction alone does not confirm a magnet. Repulsion proves that both objects a…
What is a magnetic pole?
Answer
The end of a magnet where the attractive property is maximum is called the magnetic pole. A magnet has two poles: north pole and south pole.
A bar magnet is broken into two pieces. What happens to the poles?
Answer
Each piece becomes a complete magnet with both poles. It is not possible to separate the two poles of a magnet. New poles are formed at the broken ends.
What is the magnetic field of a magnet?
Answer
The space around a bar magnet in which the magnetic compass gets influenced is called its magnetic field. A compass needle changes direction at different points around the magnet because of this field…
Which materials are magnetic materials?
Answer
Iron, steel, cobalt, and nickel are magnetic materials. They are attracted by a magnet.
Which materials are non-magnetic materials?
Answer
Paper, wood, brass, plastic, copper, and aluminum are non-magnetic materials. They are not attracted by a magnet.
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