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Physics paper 2 > P7 > Flashcards

P7 Flashcards

1
Q

Two like poles…

Two unlike poles…

A

Repel

Attract

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2
Q

Magnetic field runs from…. to…….

A

North to south

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3
Q

Magnetic materials
general
and specific examples

A

Metals

  • iron
  • nickel
  • cobalt
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4
Q

Electromagnet

How to create a electromagnet

A

When a current is passed through the wire it creates a magnetic field around the wire. This strongly magnetises the iron bar, therefore creating the electromagnet.

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5
Q

Ways to change the strength of the Electromagnet

A
  • change the current

- change the number of times the coil is wrapped arounf the iron core

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6
Q

Flemmings left hand rule

A

Thumb= motion (force)
First Finger= electromagnetic field
Second finger= current

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7
Q

The force is greatest when…

A

the wire is perpendicular with the magnetic field lines

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8
Q

The force is 0 when…

A

the wire and the magnetic field lines are parallel

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9
Q

magnetic flux density is?

A

The amount of magnetic flux in a certain area

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10
Q

Equation for magnetic flux density

A

Force= magnetic flux density x current x length

F= BIL

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Physics paper 2 (3 decks)

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