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RT 209 > 3. Magnetism and Electromagnetism > Flashcards

3. Magnetism and Electromagnetism Flashcards

1
Q

the place where magnets where discovered

A

Magnesia

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2
Q

the one who discovered magnets

A

Magnese

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3
Q

the direction of the magnetic field lines (magnetism) is from north to south but within the magnet the direction is from south to north

A

Magnetism

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4
Q

small magnet created by the electron orbit

A

Magnetic Dipole

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5
Q

an accumulation of many atomic magnets with their dipoles aligned

A

Magnetic Domain

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6
Q

is the ability of a material to attract the lines of magnetic field intensity

A

Magnetic Permeability

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7
Q

CLASSIFICATION OF MAGNETS

A
  • Naturally occurring magnets
  • Artificially induced permanent magnets
  • Electromagnets
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8
Q

consists of wire wrapped around an iron core

A

Electromagnets

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9
Q

do not react to magnetic source (wood)

A

Nonmagnetic

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10
Q

weakly repelled from the magnet (silver and gold)

A

Diamagnetic

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11
Q

highly attracted to magnets (iron)

A

Ferromagnetic

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12
Q

weakly attracted to magnet (contrast media in MRI)

A

Paramagnetic

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13
Q

the degree to which a material can be magnetized

A

Magnetic Susceptibility

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14
Q

MAGNETIC LAWS

A
  • Every magnet, no matter how small, has two poles: north and south
  • Like magnetic poles repel and unlike magnetic poles attract
  • Ferromagnetic material can be made magnetic when placed in an external magnetic field
  • The force between poles is proportional to the product of the magnetic pole strengths divided by the square of the distance between them
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15
Q

Unit for Magnetic Strength

A

SI unit: Tesla (T)

Conventional unit: Gauss (G)

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16
Q

One tesla (SI Unit; T) = _____ gauss (Conventional unit; G)

A

10000 gauss

17
Q

is the force associated with electrons in motion

A

Electromagnetism

18
Q

made the Voltaic Pile

A

Alessandro Volta

19
Q

proved that electricity can produce magnetism

A

Hans Oersted

20
Q

a coil of wire

A

Solenoid

21
Q

a ferromagnetic material wrapped in a coil of wire

A

Electromagnet

22
Q

proved that magnets can induce electricity

A

Michael Faraday

23
Q

Faraday’s experiment. When the switch in the primary circuit is closed, the ammeter in the secondary circuit deflects momentarily. The emf induced in the secondary circuit is caused by the changing magnetic field through the secondary coil

A

Faraday’s Law of Induction

24
Q

electric current will be induced to flow in a circuit if some part of that circuit is in changing magnetic field

A

Faraday’s Law

25
Q

THE MAGNITUDE OF THE INDUCED CURRENT DEPENDS ON THE FOLLOWING FOUR FACTORS:

A
  1. The strength of the magnetic field
  2. The velocity of the magnetic field as it moves past the conductor
  3. The angle of the conductor to the magnetic field
  4. The number of turns in the conductor (the higher turns more electricity
26
Q

created the Lenz’ law

A

Heinrich Lenz

27
Q

induced current flows in a direction such that it opposes the action that induced it

A

Lenz’ Law

28
Q

2 TYPES OF INDUCTION

A
  1. Self-induction

2. Mutual induction

29
Q

the induction of an opposing EMF in a single coil by its own changing magnetic field

A

Self-Induction

30
Q

the process of inducing a current flow through a secondary coil

A

Mutual Induction

31
Q

Changes mechanical energy into electrical energy

A

Electric Generator

32
Q

In ________, a coil of wire is placed in a strong magnetic field between two poles of a magnet

A

electric generator

33
Q

changes electrical energy into mechanical energy

A

Electric Motor

34
Q

energy is supplied to a series of wire loops

A

Direct Current Motor

35
Q

energy is supplied to the external magnets

A

Induction Motor

36
Q

The force between poles is ______ to the product of the magnetic pole strengths divided by the square of the ______ between them

A

proportional,

distance

RT 209 (11 decks)

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