PHY100H1 Lecture Notes - Lecture 6: Michael Faraday, Popular Science
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Document Summary
Attractive/repulsive forces (like charges repel/opposite charges attract) Scale of these forces are much stronger than gravitational force. A motor running two identical (magnetic) materials together -> the force is repulsive, hence the materials are charged. If you were to touch the ball at the top attached to said identical materials, then your hair would stand up (popular science experiment of static electricity) Spherically symmetric: a positive electron will have the same effect (attracting and repulsing other positive and negative particles on all sides. You can have only positive or negative charges. You can never have only north or south poles on a magnet. Field lines go in from south pole, and out from north pole. Electric fields and magnetic fields: moving charges (currents) produce magnetic elds. A compass on its own is re ecting the magnetic eld of the earth.
