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.
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 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?
Which factor does NOT affect the strength of an electromagnet?
(1) Number of coil turns
(2) Type of core material
(3) Thickness of insulation
(4) Amount of current
Which of the following changes will NOT increase the strength of an electromagnet?
(1) Increasing the number of turns
(2) Using a steel core instead of iron
(3) Increasing the current
(4) Using a soft iron core
Which of the following devices uses electromagnets to convert electrical energy into mechanical energy?
(1) Electric motor
(2) Transformer
(3) Battery
(4) Solar cell
Which of the following is NOT a property of an electromagnet?
(1) Its strength can be varied
(2) It can be switched on and off
(3) It is always magnetic
(4) Its polarity can be reversed
An electromagnet is created by passing an electric current through a ________ wire wound around a core.
Fill in the blank: The device that uses an electromagnet to open or close a circuit automatically is called a ________.
Fill in the blank: The magnetic field around a straight current-carrying conductor forms ________ lines around the wire.
Fill in the blank: The process of making a material magnetic by placing it in a magnetic field is called ________.
True or False: Electromagnets are used in scrapyards to lift heavy pieces of iron and steel.
True or False: Electromagnets can be turned on and off by controlling the electric current.
True or False: The direction of the magnetic field in an electromagnet can be reversed by reversing the direction of the current.
True or False: The magnetic field inside a solenoid is uniform and parallel to the axis of the solenoid.
