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 10
A coil has 200 turns and carries a current of 0.5 A. If the number of turns is halved and the current is doubled, what happens to the magnetic field strength?
A relay uses an electromagnet to control a high voltage circuit with a low voltage signal. Why is this useful?
A solenoid is a type of electromagnet. What is a solenoid?
A student builds an electromagnet with 100 turns of wire and a current of 2 A. If the number of turns is doubled but the current remains the same, by what factor does the magnetic field strength change?
Describe one advantage of using an electromagnet over a permanent magnet.
Describe one use of electromagnets in transportation systems.
Describe the role of electromagnets in loudspeakers.
Explain how an electric bell uses an electromagnet in its operation.
Explain how an electromagnet can be made stronger.
Explain why soft iron is preferred over steel as the core of an electromagnet.
If the current in the coil of an electromagnet is doubled, what happens to the strength of the magnetic field?
Name two devices in daily life that use electromagnets.
State the right-hand rule for determining the direction of the magnetic field around a current-carrying wire.
