Magnetic Effects of Electric Current

Magnetic Field and Field Lines

A magnetic field is the region around a magnet where its magnetic force can be experienced. Magnetic field lines are imaginary lines directed from the North pole to the South pole outside the magnet, and their density represents the strength of the field.

Oersted's Experiment

It demonstrates that an electric current flowing through a conductor produces a magnetic field around it, proving the fundamental link between electricity and magnetism.

Right-Hand Thumb Rule

If you hold a current-carrying straight conductor in your right hand such that your thumb points in the direction of current, then your fingers wrap around the conductor in the direction of the magnetic field lines.

Fleming's Left-Hand Rule

Used for electric motors, it states that if the thumb, forefinger, and middle finger of the left hand are stretched mutually perpendicular to each other, the forefinger points to the magnetic field, the middle finger to the current, and the thumb gives the direction of force.

Electromagnetic Induction

The process by which a changing magnetic field in a closed circuit induces an electric current, discovered by Michael Faraday and utilized in electric generators.