Lesson: Magnetic Fields Produced by Electric Currents Physics • 9th Grade

In this lesson, we will learn how to describe the magnetic field that is produced by a wire carrying an electric current.

Lesson Plan

Objectives

Students will be able to

  • recognize that an electric current in a wire will produce a magnetic field around the wire,
  • recognize that the larger the electric current in the wire, the stronger the magnetic field produced,
  • recognize and draw the shape of the magnetic field lines of the magnetic field produced by a current-carrying wire,
  • identify the direction of the magnetic field near to a current-carrying wire,
  • state what a solenoid is,
  • recognize that the magnetic field produced by a solenoid can be increased in strength by adding a core of a magnetic material.

Prerequisites

Students should already be familiar with

  • what a current is,
  • what a magnetic field is,
  • how to draw the field lines of the magnetic field produced by a bar magnet.

Exclusions

Students will not cover

  • the magnetic fields produced by moving, free charges,
  • the effect of a magnetic field on moving charges, including currents in wires,
  • the attractive or repulsive forces between two or more current-carrying wires,
  • the force experienced by a current-carrying wire in a magnetic field,
  • the shape of the magnetic field produced by a solenoid,
  • calculations of the magnetic field produced by a solenoid,
  • motors,
  • generators,
  • transformers.

Lesson Video

Video Thumbnail
14:48

Sample Question Videos

  • 03:44
  • 02:42
  • 01:55

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