Electromagnetism — Important Questions
ICSE · Class 10 · Physics
39 important questions from Electromagnetism for ICSE Class 10 Physics, with answers. Includes multiple choice, multiple correct and true false questions.
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See them allImportant Questions from Electromagnetism
Which of the following are advantages of electromagnets over permanent magnets?
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Magnetic field strength can be changed, Polarity can be reversed, Produces very strong magnetic field
Electromagnets can have their strength adjusted by changing current, polarity reversed by changing current direction, and produce very strong fields. They require electricity and can be switched off.
A solenoid behaves like a bar magnet when current flows through it.
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True
When current flows through a solenoid, it creates a magnetic field similar to a bar magnet, with distinct north and south poles at its ends.
Which of the following factors affect the speed of rotation in a DC motor?
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Current through the coil, Number of turns in coil, Strength of magnetic field, Area of the coil
The speed of DC motor increases with higher current, more turns, stronger magnetic field, and larger coil area. Wire color has no effect on motor performance.
Electromagnetic induction was discovered by:
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Michael Faraday
Michael Faraday discovered electromagnetic induction after working for about 12 years, proving that changing magnetic fields can produce electric current.
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