Hard drives use tiny magnetic signatures to "remember" 1s and 0s.
Magnetic fields are created whenever electric charges (like electrons) are in motion. magnetic force
When current flows through a wire, it creates a magnetic field around that wire. This is the principle behind electromagnets. 2. The Rules: Opposites Attract Every magnet has two poles: North and South . Attraction: North and South poles pull toward each other. Hard drives use tiny magnetic signatures to "remember"
Even though a kitchen magnet looks still, the electrons inside its atoms are spinning and orbiting in a coordinated way, creating a collective magnetic field. creating a collective magnetic field.