simple phenomena of magnetism Flashcards

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1
Q

what are the 2 poles of a magnet

A

north and south

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2
Q

what are examples of ferrous magnetic materials

A

iron and steel

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3
Q

what are non ferrous materials

A

non- magnetic materials eg: copper and aluminium

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4
Q

what is a hard and soft magnet

A

hard: retains its magnetism ( steel)
soft: loses its magnetism easily ( iron)

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5
Q

what are permenant magnets made of

A

steel

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6
Q
A
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7
Q

what is induced magnetism

A

a material is made into a magnet by its closeness to a magnetic material

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8
Q

how can a magnet me demagnetized

A

hitting it or heating
placing a magnet inside a coil,, using a ac current, then slowly remiving the magnet

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9
Q

what is a magnetic field

A

region where a pagnetic pole experiences a force

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10
Q

what is the only test for a magnet

A

repulsion

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11
Q

how to make a permenant magnet

A

place a steel rod insde a coil, use highh dc current for a time, leave steel inside then turn of current

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12
Q

how to increase the strength of a electro magnet

A

use a iron core
more current
more turns of wire

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13
Q

what is iron in terms of magnetism

A

temporary soft magnet

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14
Q

what are examples of electromagnets

A

electric bells, loudspeekers, some microphones

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15
Q
A
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