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Increase strength of magnet | Discoveries and projects | Physics | Khan Academy
Permanent Magnet effect on a compass
How To Properly Store Your Magnets
What Will Happen When Earth's North And South Pole Flip?
Physics & Electromagnetism : Polarity of Electromagnets
Electromagnetic Induction: by Magnet
Inductive spiking, and how to fix it!
The Magnetic Compass