# GCSE Physics OCR - magnetic fields

GCSE Physics revision of Magnetic fields

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• Created by: harry
• Created on: 15-04-13 18:03
What is a magnetic field?
It is a region where magnetic materials or a current carrying wire experience a force acting on them
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What is the shape of the magnetic field around a straight current-carrying wire?
Concentric circles with the current at the centre
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What method can you use to find out the direction of the magnetic field?
Right-hand thumb method (clench fist with the thumb pointing in the direction of the current and the fingers curl in the direction of the field
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Does a rectangular coil reinforce or weaken the magnetic field?
Reinforces it
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Why does this happen?
Because the magnetic fields on each side of the coil reinforce each other at the centre
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What is a Solenoid?
A coil of wire
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How can you increase the strength of the magnetic field?
By increasing the number of turns or by adding a magnetically soft iron core through the middle of the coil
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Describe the magnetic field of a Solenoid
Inside the coil it is straight and regular and outside it is the same as a bar magnet with each end of the coil acting like N and S poles
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## Other cards in this set

### Card 2

#### Front

What is the shape of the magnetic field around a straight current-carrying wire?

#### Back

Concentric circles with the current at the centre

### Card 3

#### Front

What method can you use to find out the direction of the magnetic field?

### Card 4

#### Front

Does a rectangular coil reinforce or weaken the magnetic field?

### Card 5

#### Front

Why does this happen?