Electromagnets and Applications
Physics ⇒ Electricity and Magnetism
Electromagnets and Applications starts at 8 and continues till grade 12.
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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?
A relay in a car uses an electromagnet to control the starter motor. Is this an example of an electromagnet application?
Which device uses an electromagnet to convert electrical energy into mechanical energy?
(1) Transformer
(2) Electric motor
(3) Battery
(4) Capacitor
Which of the following best describes the function of the core in an electromagnet?
(1) To conduct electricity
(2) To increase the magnetic field strength
(3) To decrease resistance
(4) To store charge
Which of the following devices uses an electromagnet to produce sound?
(1) Microphone
(2) Loudspeaker
(3) Thermometer
(4) Voltmeter
Which of the following factors does NOT affect the strength of an electromagnet?
(1) Number of coil turns
(2) Core material
(3) Length of the wire
(4) Magnitude of current
An electromagnet is created by passing an electric current through a ________ wire wound around a core.
Fill in the blank: The direction of the magnetic field around a current-carrying wire can be determined using the ________ rule.
Fill in the blank: The magnetic field produced by an electromagnet is ________ when the current is switched off.
Fill in the blank: The strength of an electromagnet can be increased by increasing the ________ of the current passing through the coil.
A relay in a car uses an electromagnet to control the starter motor. Is this an example of an electromagnet application?
A relay uses an electromagnet to open or close a switch in a circuit. Is this statement true or false?
True or False: Electromagnets can be used to separate magnetic materials from non-magnetic materials in recycling plants.
True or False: Increasing the number of turns in the coil of an electromagnet increases its magnetic field strength.
