GCSE Physics (AQA)

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Magnetic Field Around a Solenoid

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Magnetism and electromagnetism The motor effect

Magnetic Field Around a Solenoid

4:43 Induced Magnetism
Spec 4.7.2.1
Previous Solenoids Next Using Solenoids
  • Each loop of wire in a solenoid produces a magnetic field.
  • A solenoid is created by repeatedly coiling a wire.
  • Passing a current through a solenoid produces a strong magnetic field.
  • The direction of the magnetic field can be determined using the right-hand grip rule.
  • The magnetic field appears to go through the middle of the coil and around the outside.
  • Combining loops increases the magnetic field size.
  • The magnetic field outside a solenoid is similar to that of a bar magnet.
  • Field lines start at one end (north pole) and finish at the other end (south pole).
  • Unlike a bar magnet, solenoids have field lines inside them.
  • The magnetic field inside a solenoid is strong and uniform.
  • For exams, it's important to draw the field pattern correctly, including parallel lines inside.
  • The strength of the magnetic field can be increased by:
  • 1. Increasing the current.
  • 2. Using more wire loops.
  • 3. Reducing the space between loops.
  • 4. Adding an iron core to the solenoid.
  • These methods increase the strength of the field and are important for real-life solenoids.

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