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imeqma > magnetism > Flashcards

magnetism Flashcards

1
Q

where objects are attracted or repelled to one another

A

magnetism

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2
Q

● magnetic oxide of iron
● rod-like stone that when suspended by a
string, it rotates back and forth.
● most magnetic of all naturally occurring
minerals on earth.

A

magnetite

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3
Q

● accumulation of many atomic magnets with their dipoles aligned
● If all of these magnetic domain aligned, it will create a magnet

A

magnetic domain

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4
Q

● nuclear magnetic dipole
● rotates on its own axis and produces
magnetic field

A

magnetic moment

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5
Q

● ability of a material to attract the lines of magnetic field density
● refers to a material’s ability to absorb magnetic flux (change)

A

magnetic permeability

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6
Q

● degree to which a material can be magnetized
● ability of a material to become magnetized by an external magnetic field

A

magnetic susceptibility

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7
Q

classification of magnets

A

natura magnet
artificial magnet
electromagnet

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8
Q
  • magnets that occur in nature.
  • best example is EARTH
A

natural magnet

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9
Q
  • Strong magnetic fields that do not fade.
  • Man-made
A

artificial magnet

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10
Q

best example of artificial magnet

A

magnetic compass

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11
Q

● temporary magnets produced by means of an electric current.
● magnets that run on electricity
● simply the coils of wire usually wrapped
around an iron core.
● strength of magnetic field is directly
proportional to the amount of current

A

electromagnet

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12
Q

coil of wire

A

solenoid

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13
Q

4 magnetic states of matter

A

non magnetic
ferromagnetic
paramagnetic
diamagnetic

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14
Q

unaffected when brought into the magnetic field.

A

non magnetic

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15
Q

ex of non magnetic

A

wood and glass

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16
Q

● have a large, positive susceptibility to an external magnetic field
● exhibit strong attraction to magnetic field
● made by human

A

ferromagnetic

17
Q

ex of ferromagnetic

A

iron, alnico

18
Q

● lies somewhere within ferromagnets and diamagnets.
● Does not retain the magnetic properties when an external field is removed

A

paramagnetic

19
Q

ex of paramagnetic, used as main component of contrast agent in MRI

A

gadolinium

20
Q

weakly repelled from both poles of a magnetic field.

A

diamagnetic

21
Q

ex of diamagnetic

A

water and plastic

22
Q

magnetic laws

A

dipole
attraction and repulsion
induction
magnetic force

23
Q

states that dividing a magnet into smaller pieces will only create small magnets with north and south poles

A

dipole

24
Q

proportional to the product of the magnetic pole strengths divided by the square of the distance between them

A

magnetic force

25
Q

electrostatic charge can be
induced from one material to another, so some materials can be made by induction

A

induction

26
Q

SI unit of magnesium field strength

A

tesla

27
Q

older SI unit of magnesium field strength

A

gauss

28
Q

The earth’s magnetic field strength is approximately __ at the equator in both poles __

A

50uT, 100uT

29
Q

● observed that the legs of the frog twitched during dissection when two metals touched.

A

Luigi Galvanni

30
Q

● invented Voltaic Pile
● First “wet cell battery”
● Sandwiched Zn and Cu

A

Alessandro Volta

31
Q

● discovered that the electric current creates a magnetic field.
● Any charged particle in motion induces a magnetic field

A

Hans Oersted

32
Q

● Credited the discovery of induction in 1831
● Concluded that the magnetic field cant be used to generate electric current.
● Made the first dynamo in 1837

A

Michael Faraday

33
Q

states that the direction of the induced current opposes the action that induces it.

A

Heinrich Lenz, Lenz Law

34
Q

● Practical application of Faraday’s law.
● A device that converts mechanical
energy to electrical energy
● Can be called energy converter

A

electric generator

35
Q

● Practical application of Oersted Discovery.
● Transform Electrical Energy to Mechanical Energy

A

electric motor

imeqma (3 decks)

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