Magnetism and Electromagnetism The Final Chapter Flashcards

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1
Q

What was the name for naturally occurring magnetic rock called in Greek Times

A

Lodestone

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2
Q

What is the name for naturally occurring magnetic rock called now

A

Magnite

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3
Q

What is Ferromagnatism

A

Substance that is naturally or permanently magnetic

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4
Q

What is Para magnetic magnatism

A

Materials which are attracted to magnetic fields and can retain magnetism properties for a short time

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5
Q

What is Diamagnatism

A

Repelled by a magnetic field

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6
Q

What are crystals divided up into

A

Crystallites or grains

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7
Q

What are Grains

A

The grains are regions within the crystal latices that are misaligned with respect to one another

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8
Q

What are domains

A

Regions of atoms with their magnetic fields aligned in the same direction

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9
Q

Who discovered magnetism and electric currents had something in common

A

Hans Oersted (1812)

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10
Q

Who came up with the mathematical formula for what Hans had discovered

A

Andre-Marrie Ampere

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11
Q

WHAT IS AMPERE’S LAW

A

A current carrying wire produces a magnetic field around it and with the strength of the magnetic field is directly proportional to the current carrying wire

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12
Q

What are brushes

A

Contact Points on the axle

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13
Q

What is Brush less DC stand for

A

BLDC

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14
Q

What is an Electromagnet

A

An electric current which produces a magnetic field which can be turned on and off

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