3.4.16

Strength of Magnetic Fields

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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.

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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.
Illustrative background for For a coil of wire (solenoid)Illustrative background for For a coil of wire (solenoid) ?? "content

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.
  • Increasing the size of the current increases the strength of the magnetic field produced by a solenoid.

Jump to other topics

1Biology

1.1Cells, Tissues & Organs

1.2Reproduction & Variation

1.3Ecological Relationships & Classification

1.4Digestion & Nutrition

1.5Plants & Photosynthesis

1.6Biological Systems & Processes

2Chemistry

2.1Particles

2.2Chemical Reactions

2.3Atoms, Elements, Compounds

2.4The Periodic Table

2.5Materials & the Earth

2.6Reactivity

2.7Energetics

2.8Properties of Materials

3Physics

3.1Energy

3.2Forces & Motion

3.3Waves

3.4Electricity & Magnetism

3.5Matter

3.6Space Physics

4Thinking Scientifically

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