Physics › Section P · Magnetism › Topic P.5
Fields from currents and forces between wires
Every current makes a magnetic field, and the shape of the wire decides the shape of the field. This topic finds the fields of wires, loops and coils, the force one current exerts on another, and how these ideas run an MRI scanner.
In this topic
- Currents make fields
- A long straight wire
- Worked example: matching Earth's field
- Loops and solenoids
- Worked example: field inside a solenoid
- Forces between parallel wires
- Worked example: jump-starting a car
- Defining the ampere
- Magnetism in medicine and the lab
- Common mistakes to avoid
- Key takeaways
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