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Magnetism Flashcards

1
Q

What is magnetism?

A

Magnetism is a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.

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2
Q

True or False: All materials can be magnetized.

A

False

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3
Q

What are the two poles of a magnet called?

A

North pole and South pole

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4
Q

Fill in the blank: Like poles of magnets ______ each other.

A

repel

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5
Q

Fill in the blank: Unlike poles of magnets ______ each other.

A

attract

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6
Q

What is the unit of magnetic field strength?

A

Tesla (T)

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7
Q

What is a magnetic field?

A

A magnetic field is the region around a magnet where magnetic forces can be detected.

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8
Q

What material is commonly used in making permanent magnets?

A

Iron, cobalt, or nickel

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9
Q

True or False: The Earth has a magnetic field.

A

True

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10
Q

What is the direction of magnetic field lines around a magnet?

A

From the North pole to the South pole

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11
Q

What is an electromagnet?

A

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

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12
Q

Multiple Choice: Which of the following is NOT a property of magnets? A) Attracts iron B) Has a North and South pole C) Conducts electricity D) Can repel another magnet

A

C) Conducts electricity

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13
Q

What happens to the magnetic field of an electromagnet when the current is turned off?

A

The magnetic field disappears.

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14
Q

Fill in the blank: The area around a magnet where magnetic forces can be felt is called the ______.

A

magnetic field

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15
Q

What is magnetic flux?

A

Magnetic flux is the product of the magnetic field strength and the area perpendicular to the field.

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16
Q

True or False: Magnetic fields can penetrate through most materials.

A

True

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17
Q

What is the right-hand rule used for in magnetism?

A

To determine the direction of the magnetic field around a current-carrying conductor.

18
Q

What is the term for materials that can be easily magnetized?

A

Ferromagnetic materials

19
Q

Multiple Choice: Which of the following is an example of a non-magnetic material? A) Iron B) Copper C) Cobalt D) Nickel

20
Q

Fill in the blank: The force experienced by a charged particle moving in a magnetic field is called the ______ force.

21
Q

What is the function of a compass?

A

To indicate the direction of the Earth’s magnetic field.

22
Q

True or False: A magnet can lose its magnetism if heated above a certain temperature.

23
Q

What is the phenomenon where a magnetic field induces an electric current called?

A

Electromagnetic induction

24
Q

What device uses electromagnetic induction to generate electricity?

25
Q

What is the formula for calculating magnetic force on a charged particle?

A

F = qvBsin(θ)

26
Q

Fill in the blank: The strength of the magnetic field is directly proportional to the ______.

27
Q

What is the purpose of a magnetic shield?

A

To protect sensitive equipment from external magnetic fields.

28
Q

True or False: All magnets are attracted to all metals.

29
Q

What is magnetic hysteresis?

A

The lag between changes in the magnetization of a material and changes in the magnetic field.

30
Q

What type of magnet is made from a material that retains its magnetism after the external magnetic field is removed?

A

Permanent magnet

31
Q

Multiple Choice: Which of the following is a type of magnetic material? A) Aluminum B) Steel C) Plastic D) Wood

32
Q

What is the term for the distance between two consecutive peaks of a magnetic wave?

A

Wavelength

33
Q

Fill in the blank: The magnetic field inside a solenoid is ______ and ______.

A

uniform; strong

34
Q

What is the role of a magnetic field in a transformer?

A

To transfer energy between the primary and secondary coils.

35
Q

True or False: The strength of a magnetic field decreases with distance from the magnet.

36
Q

What is the main difference between temporary and permanent magnets?

A

Temporary magnets lose their magnetism quickly, while permanent magnets retain their magnetism.

37
Q

Fill in the blank: The magnetic field lines are ______ in regions of strong magnetic fields.

A

closely spaced

38
Q

What is the principle of operation of a motor based on?

A

The interaction between a magnetic field and an electric current.

39
Q

Multiple Choice: Which of the following describes a magnetic monopole? A) A magnet with only one pole B) A magnet with both poles C) A magnet that is permanently magnetized D) A magnet that can be turned off

A

A) A magnet with only one pole

40
Q

What phenomenon occurs when a magnet is dropped and loses its magnetism?

A

Demagnetization

Magnetism (1 decks)

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