Magnetic fields

What you'll learn

• Understand that a magnetic field is a field of force produced by moving charges or permanent magnets.
• Represent a magnetic field using field lines.
• Recall and use the equation F = BIL sin θ, applying Fleming’s left-hand rule for directions.
• Define magnetic flux density as the force acting per unit current per unit length on a wire placed at right angles to the magnetic field.
• Determine the direction of the force on a charge moving in a magnetic field and use F = BQv sin θ.
• Understand the origin of the Hall voltage and derive and use the expression VH = BI/(ntq).
• Sketch magnetic field patterns due to currents in a long straight wire, a flat circular coil, and a long solenoid.
• Define magnetic flux as the product of magnetic flux density and the cross-sectional area perpendicular to the direction of the magnetic flux density, and use Φ = BA.
• Recall and use Faraday’s law and Lenz’s law of electromagnetic induction.

Study tools for this chapter

Pick a format and jump in — all tools are syllabus-mapped to Magnetic fields.

About Magnetic fields on Nexelia Academy

Frequently asked questions about Magnetic fields