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 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?
Which factor does NOT affect the strength of an electromagnet?
(1) Number of coils
(2) Type of core material
(3) Color of the wire
(4) Amount of current
Which of the following devices uses electromagnets to convert electrical energy into mechanical energy?
(1) Electric motor
(2) Loudspeaker
(3) Transformer
(4) Both 1 and 2
Which of the following is a correct statement about the core of an electromagnet?
(1) It must be made of plastic.
(2) It should be a good conductor of electricity.
(3) It should be a material that can be easily magnetized and demagnetized.
(4) It must be a permanent magnet.
Which of the following is a correct way to increase the strength of an electromagnet?
(1) Use fewer coils
(2) Use a wooden core
(3) Increase the current
(4) Decrease the voltage
Fill in the blank: An electromagnet requires ________ to produce a magnetic field.
Fill in the blank: Electromagnets are widely used in ________ yards to lift heavy pieces of metal.
Fill in the blank: The device that uses an electromagnet to convert electrical signals into sound is called a ________.
Fill in the blank: The device that uses an electromagnet to ring when someone presses a button is called a ________.
True or False: Electromagnets are permanent magnets.
True or False: Electromagnets can be used to separate magnetic materials from non-magnetic materials.
True or False: Increasing the voltage supplied to an electromagnet will increase its magnetic strength.
True or False: Removing the iron core from an electromagnet will make it weaker.
