FI2 & FI3 Notes

FI2- Electricity and Magnetism Electricity has negatively charged particles and positively charged particles. Magnetism only has negative charged fields but they are ordered and travel in different directions depending on the pole. Both electricity (electric force) and magnetism can be attractive or repulsive. With both types of forces like charges/poles are repulsive and opposite charges/poles are attractive. Draw the diagram 1. Electricity is measured in different units for different things, but our main concern is current. Current is the flow of electric charge, so the more current the more charge moving through the wires.

Magnetisms magnitude or strength is most easily seen by looking at the magnetic field lines. The closer the field lines are together the stronger magnetic force.

FI3- How do electric and magnetic forces interact? Electric forces interact because of their charge. Two of the same charges will repel, two different charges will attract. This happens because all things in nature want to be electrical neutral. If two of the same charges were together that would make the object even farther from neutral, so they repel each other. If two different charges come together they attract and cancel the charges out to become neutral. The stronger the magnitude of the charges the stronger these reactions are. Draw diagram 2.

Magnetic forces interact based on their poles Magnetic forces interact based on their poles. Since all magnets have a force field that is created by moving electrons, magnetic interaction depends on which direction the electrons are moving. All north poles have electrons moving out and away from them. All south poles have electrons moving in and towards them. So two north poles together would be throwing electrons at each other and force the two poles away. Two south poles react similarly. A north pole and a south pole together would be a north pole throwing electrons into a south pole directly so they would attract and move together.