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Electromagnetism - Coggle Diagram
Electromagnetism
Magnetism
Properties of magnets
Magnets attract ferromagnetic materials such as iron, nickel and cobalt.
A freely suspended magnet always faces north-south.
Like poles repel and opposite poles attract each other.
Ferromagnetic materials
In nature, there are 3 ferromagnetic materials: iron, nickel and cobalt.
When they are brought into the vicinity of a magnet, they temporarily become magnetised. This process is called magnetic induction.
Magnetic domains
Ferromagnets have groups of atoms inside them called magnetic domains. The atoms inside these domains have their poles aligned.
When the ferromagnetic material is placed near a magnet, all of it's domains align, and the material gains a temporary magnetic field.
Magnetic fields
The area around a magnet in which the force of the magnet can be experienced is known as a magnetic field.
The closeness of the magnetic field lines represents the strength of the field as a whole.
The field lines form closed and continuous loops, starting from the north pole and ending at the south pole of the magnet.
Static Electricity
Current Electricity
The flow of charges ar called electric current.
When charges are not moving it is called static electricity.
Charges come from atoms. Solid Matter is more than 99% empty space.
Coulomb's Law
The force between any two charges objects is directly proportional to the product of the charge on them.
The force between any two object are inversely proportion to the square of the distance between the object.
F=k((q1xq2)/d2)
K--> Coulomb's constant= 9x10^9
SI unit coulombs
Conduction&Induction
Charging by friction--> the object losses electrons
Law of Charges
Like charges repel each other
Unlike charges attract each other
Grounding
Grounding Wire--> Conductor that connects the object to the ground.
Earth is like a huge reservoir of charge. it can both gain or donate electrons as needed. Electrons will travel up or down through the grounding wire depending on the situation
Electrostatic Series
Sulphur, brass, copper, ebonite, paraffin wax, silk, lead, fur, wool, glass. Going down the list their is more tendency to lose electrons and going up the lest their is more tendency to hold on the electrons.