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 9
A scrapyard uses a large electromagnet to lift cars. Why is an electromagnet used instead of a permanent magnet?
A solenoid is a coil of wire. What happens to the magnetic field inside the solenoid when the current is increased?
A student wraps 100 turns of wire around an iron nail and connects it to a battery. What type of magnet has the student created?
Describe how an electric bell works using an electromagnet.
A relay switch uses an electromagnet to open or close a circuit. Is this statement true or false?
A scrapyard uses a large electromagnet to lift cars. Why is an electromagnet used instead of a permanent magnet?
A solenoid is a coil of wire. What happens to the magnetic field inside the solenoid when the current is increased?
A student wants to pick up more paper clips with their electromagnet. Which change would be most effective?
(1) Use a wooden core
(2) Decrease the number of coils
(3) Increase the current
(4) Use thinner wire
A student wants to pick up more paper clips with their electromagnet. Which change would be most effective?
(1) Use a wooden core
(2) Decrease the number of coils
(3) Increase the current
(4) Use thinner wire
Which of the following devices uses an electromagnet to operate?
(1) Light bulb
(2) Electric fan
(3) Electric bell
(4) Solar panel
Which of the following is a medical application of electromagnets?
(1) X-ray machine
(2) MRI scanner
(3) Thermometer
(4) Stethoscope
Which of the following is NOT a factor affecting the strength of an electromagnet?
(1) Number of turns in the coil
(2) Type of core material
(3) Length of the wire
(4) Amount of current
Fill in the blank: The core of an electromagnet should be made of a material that is easily ________.
Fill in the blank: The device that uses an electromagnet to convert electrical energy into mechanical energy is called a ________.
Fill in the blank: The ends of an electromagnet act as the ________ and ________ poles.
Fill in the blank: The magnetic field inside a solenoid is ________ and strong.
A relay switch uses an electromagnet to open or close a circuit. Is this statement true or false?
True or False: Electromagnets are used in loudspeakers to produce sound.
True or False: Electromagnets are used in scrapyards to lift heavy pieces of metal.
True or False: Increasing the voltage supplied to an electromagnet will increase its magnetic strength.
