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
A solenoid has 500 turns and carries a current of 2 A. What is the magnetic field inside the solenoid if its length is 0.5 m? (Use μ₀ = 4π × 10⁻⁷ T·m/A)
A solenoid is 1 m long and has 1000 turns. If a current of 3 A flows through it, calculate the magnetic field inside the solenoid. (μ₀ = 4π × 10⁻⁷ T·m/A)
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 a solenoid has 200 turns per meter and carries a current of 0.5 A, what is the magnetic field inside the solenoid? (μ₀ = 4π × 10⁻⁷ T·m/A)
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?
Name the law that explains the direction of the magnetic field around a current-carrying conductor.
State the formula for the magnetic field inside a long solenoid.
State two practical applications of electromagnets in everyday life.
