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PHYSICS [3 Mark Question Answer]

Magnetism · ICSE STD 9 (ICSE - English Medium). 3 questions.

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[3 Mark Question Answer]

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3 questions · timed · auto-graded

Question 13 Marks
State two differences between an electromagnet and a permanent magnet.
Answer
Electromagnet Permanent magnet
It is made up of soft iron It is made up of steel
The magnetic field strength can be changed The magnetic field strength cannot be changed
Electromagnets of very strong field can be made. Permanent magnets are not so strong.
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Question 23 Marks
A small magnet is suspended by a silk thread from a rigid support such that the magnet can freely swing. How will it rest? Draw a diagram to show it.
Answer
If a small magnet is suspended by a silk thread such that it can swing freely then it rests itself in the geographic north-south direction.
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Question 33 Marks
A small iron bar is kept near the north pole of a bar magnet. How does the iron bar acquire magnetism? Draw a diagram to show the polarity on the iron bar. What will happen if the magnet is removed?
Answer
The iron bar acquires magnetism due to magnetic induction.


If the magnet is removed, the iron bar loses its magnetism.
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[3 Mark Question Answer] - PHYSICS STD 9 Questions - Vidyadip