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Magnetic field patterns of a wire and solenoid

Magnetism and electromagnetism • The motor effect

Key concepts

What you'll likely be quizzed about

  • A straight wire carrying an electric current generates a circular magnetic field around itself.
  • The direction of this magnetic field can be determined using the right-hand grip rule: when the thumb points in the direction of the current, the curled fingers indicate the direction of the magnetic field lines.
  • The strength of the magnetic field decreases with distance from the wire, being strongest closest to it.

Flashcards

Test your knowledge with interactive flashcards

What is the effect of the number of coils in a solenoid?

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Increasing the number of coils in a solenoid strengthens the magnetic field produced.

Key notes

Important points to keep in mind

Use the right-hand rule for direction.

Field strength varies with distance from the wire.

Solenoids produce uniform magnetic fields inside.

Increased wire turns in a solenoid enhance the field.

Magnetic field lines indicate field strength.

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