Electromagnets and Applications
Physics ⇒ Electricity and Magnetism
Electromagnets and Applications starts at 8 and continues till grade 12.
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See sample questions for grade 12
Describe how an electric bell uses an electromagnet to produce sound.
Describe the difference between a permanent magnet and an electromagnet.
Explain why electromagnets are used in scrap yards to lift heavy pieces of iron and steel.
Explain why soft iron is preferred over steel as the core material in electromagnets.
Explain why the magnetic field inside a solenoid is uniform and strong compared to outside the solenoid.
If the current in the coil of an electromagnet is doubled, what happens to the magnetic field strength?
If the direction of current in the coil of an electromagnet is reversed, what happens to the polarity of the electromagnet?
State the formula for the magnetic field inside a long solenoid.
State two practical applications of electromagnets in everyday life.
