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AQA GCSE Physics > P15 - Electromagnetism > Flashcards

P15 - Electromagnetism Flashcards

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1
Q

Like poles?

Unlike poles?

A

Like poles repel

Unlike poles attract

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2
Q

Any iron or steel object?

A

Can be magnetised or demagnetised

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3
Q

Region around magnet?

A

Magnetic field

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4
Q

Magnetic field lines?

A

Lines of force

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5
Q

Line of force direction?

A

Always n-s pole

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6
Q

Induced magnetism?

A

Placing an unmagnetised magnetic material in a magnetic field

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7
Q

Iron and steel are what type of magnet?

A

Permanent magnet

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8
Q

Solenoid?

A

A long insulated coil of wire

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9
Q

Shape of magnetic field lines in solenoid?

A

Each is a complete loop

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10
Q

Electromagnet?

A

A solenoid where insulated wire is wrapped around iron bar

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11
Q

Reversing the current…

A

Reverses the magnetic field lines

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12
Q

Uniform magnetic field?

A

one in which the magnetic field lines are parallel

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13
Q

Magnetic field lines around a wire?

A

circles centred on the wire in plane perpendicular to the wire

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14
Q

E. Magnetic flux density?

A 
force = megetic flux density x current x length             
(N)     =             (T, tesla)         x       (I)     x   (M)
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15
Q

D. Motor effect?

A

When a current is passed along a wire in a magnetic field, and the wire is not parallel to the lines of the magnetic field, a force is exerted on the wire by the magnetic field

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16
Q

D. Magnetic flux density?

A

the measure of the strength of a magnetic field - (B is the symbol and is measured in teslas, T)

17
Q

Flemming’s left hand rule?

A

a rule that gives the direction of the force on a current-carrying wire in a magnetic field according ti the directions of current and field

18
Q

D. Split ring commutator?

A

Metal contacts on the coil of a direct current motor that connects the rotating coil continuously to its electrical power supply

19
Q

Why does the coil spin when current is passed through it?

A
  • a force acts on each side due to the motor effect

- `the force on one side is in the opposite direction of the force on the other side

AQA GCSE Physics (15 decks)

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