Magnetic Field Strength
Physics: AQA GCSE Higher, topic 7.2.3
Magnetic Field Strength
The closer together magnetic field lines are, the stronger the magnetic field. Coiling wire around an iron core increases the amount of wire over a shorter distance and all the magnetic field lines are in the same direction.
For a straight wire
- For a straight wire carrying a current, the magnetic field is strongest at the points closest to the wire, and weakest further away from the wire.
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For a coil of wire (solenoid)
- For a solenoid (coil of wire), the magnetic field inside the solenoid is strong and uniform.
- Outside of the solenoid the magnetic field decreases in strength the further away it is from the solenoid.
Test yourself on Magnetic Field Strength
Where is a magnetic field around a wire strongest?
Select the correct statement in each pair.
What is the magnetic field inside a coil of wire (solenoid) like?