P15 - Electromagnetism Flashcards Preview

AQA GCSE Physics > P15 - Electromagnetism > Flashcards

Flashcards in P15 - Electromagnetism Deck (19)
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1

Like poles?
Unlike poles?

Like poles repel
Unlike poles attract

2

Any iron or steel object?

Can be magnetised or demagnetised

3

Region around magnet?

Magnetic field

4

Magnetic field lines?

Lines of force

5

Line of force direction?

Always n-s pole

6

Induced magnetism?

Placing an unmagnetised magnetic material in a magnetic field

7

Iron and steel are what type of magnet?

Permanent magnet

8

Solenoid?

A long insulated coil of wire

9

Shape of magnetic field lines in solenoid?

Each is a complete loop

10

Electromagnet?

A solenoid where insulated wire is wrapped around iron bar

11

Reversing the current...

Reverses the magnetic field lines

12

Uniform magnetic field?

one in which the magnetic field lines are parallel

13

Magnetic field lines around a wire?

circles centred on the wire in plane perpendicular to the wire

14

E. Magnetic flux density?

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

15

D. Motor effect?

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

16

D. Magnetic flux density?

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

17

Flemming's left hand rule?

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

D. Split ring commutator?

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

19

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

- 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