magnetism Flashcards

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1
Q

what is magnetism?

A

an invisible force that pushes or pulls magnetic material only

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2
Q

what is a magnetic field?

A

the area where magnetic forces attract

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3
Q

describe the poles on a magnet.

A

every magnet has two poles, the north and south. like poles repel and unlike poles attract.

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4
Q

what are the 3 magnetic metals?

A

iron cobalt and nickel but they only attract to magnets not to eachother

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5
Q

what are the uses of the magnetic metals?

A

they are used in turbines and other industrial products because of their high tolerance to heat

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6
Q

from which pole does the magnetic travel to?

A

NORTH TO SOUTH ALWAYS

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7
Q

what is a permanent magnet?

A

their magnetism is there all the time and cannot be turned on nor off

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8
Q

what is an induced magnet/electromagnet?

A

the magnetism can be turned on and off. this is by putting it in a magnetic field of a permanent magnet.

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9
Q

what is a domain?

A

group of spinning electrons. a tiny magnet within a material

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10
Q

how do we know which pole is north?

A

domains always point to the north pole

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11
Q

what is the motor effect?

A

when a current carrying wire is placed in a magnetic field, it will experience a magnetic force (provided the force is not parallel to the field)

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12
Q

what is fleming’s left hand rule?

A

tells us the direction of the current when we know the force and the magnetic field

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13
Q

we use FBI for each of the fingers in flemings rule, what do each of the letters mean and for what fingers are they for?

A

F: Force, thumb
B: Magnetic field, index
I: Current, middle

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14
Q

what is a soft magnetic material?

A

e.g. iron

can only temporarily be magnetised

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15
Q

what is a hard magnetic material?

A

e.g. steel

permanently magnetised

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