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How does an electromagnet differ from a permanent magnet?

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Important Questions on Magnetism and Electromagnetism

HARD
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
Which of the following applications uses electromagnets to separate materials?
HARD
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
How can the strength of an electromagnet be increased?
MEDIUM
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
What is an electromagnet?
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Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
What would happen if the current through an electromagnet is turned off?
HARD
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
What happens to the strength of an electromagnet if the voltage is increased?
HARD
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
What is the advantage of using an electromagnet over a permanent magnet in industrial applications?
MEDIUM
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
How does the number of coils affect the strength of an electromagnet?
EASY
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
The magnetic field used in MRI is about ____________ times stronger than that of the earth's magnetic field.
HARD
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
What is the primary function of an electromagnet in a relay?
HARD
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
How does the core material affect the strength of an electromagnet?
HARD
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
Which of the following devices uses electromagnets to generate a magnetic field?
HARD
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
Which of the following is an example of an application of an electromagnet?
MEDIUM
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
Which of the following materials is commonly used as the core of an electromagnet?
MEDIUM
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
What type of current is used to create an electromagnet?
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Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
What is the relationship between the current and the strength of an electromagnet?
HARD
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
Which of the following factors affects the magnetic field of an electromagnet?
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Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
Magnetic field produced is most significant in which of the following two organs of human body?
HARD
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
What is the primary use of electromagnets in electric motors?
HARD
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
In which of the following applications are electromagnets used for medical purposes?
MEDIUM
Science>Physics>Magnetism and Electromagnetism>Electro Magnets and Applications of Electromagnets
What is the role of the electric current in an electromagnet?