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 8
A coil of wire is wrapped around a nail and connected to a battery. If the battery is replaced with a stronger one, what will happen to the electromagnet?
A relay uses an electromagnet to open or close a switch in a circuit. What is the main advantage of using a relay?
A solenoid is a coil of wire. What happens when an electric current passes through a solenoid with an iron core?
A student builds an electromagnet with 50 turns of wire and a current of 2 A. If the number of turns is increased to 100, what happens to the magnetic field strength?
A student wraps 100 turns of wire around an iron nail and connects it to a battery. What type of magnet has the student made?
Describe one advantage of using an electromagnet over a permanent magnet.
Describe one use of electromagnets in transportation.
Describe one way to make an electromagnet stronger.
Describe what happens to the magnetic field if the number of turns in the coil of an electromagnet is halved.
Explain how an electric bell uses an electromagnet.
Explain why electromagnets are used in scrapyard cranes instead of permanent magnets.
Explain why soft iron is preferred as the core material for electromagnets.
Explain why the magnetic field of an electromagnet disappears when the current is switched off.
If the current in the coil of an electromagnet is doubled, what happens to the strength of the magnetic field?
What happens to the magnetic field of an electromagnet when the electric current is switched off?
What is an electromagnet?
Which part of an electromagnet becomes magnetized when current flows through the coil?
