Electricity & Magnetism Basics
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Electricity and Magnetism
Coulomb’s Law – Electrostatic force
The Electrostatic force is an attraction or a repulsion force. It depends on the charges and distance between them.
What’s Static Electricity? – Examples
Static electricity is static, since it is a current that is going nowhere. Both, DC and AC current flow in some direction, but static electricity does not.
Electric Field – Lines of Force – Electric Field Unit
If a charge Q is affected by an electrostatic force, there is an electric field. If at some point the electric field is known, we can find the electrostatic force on a charge Q at that point
Electricity and structure of matter
The matter is divided into molecules, which in turn are divided into atoms. These atoms are composed of two parts: nucleus and periphery.
Positive and Negative Charges – (electrons, protons, neutrons)
If a body has more electrons than protons, it is negatively charged. If it has more protons than electrons it is positively charged
What is an electric charge?
The electron (or proton, since they have the same charge) is the basic unit of electric charge. We can therefore consider the electron as the elementary unit of electric charge.
Magnetic Field – Magnetic Field Lines
Magnets. Charges in motion (electric current) behave like magnets (produce magnetic fields)
Polarization of a conducting material
If an electric field is close to a metallic body, part of it is positively charged and other part negatively charged
First Right Hand Rule
The First Right-hand Rule or (Magnetic Force induced on a Current-Carrying Wire) says that if a current-carrying wire is in the presence of a magnetic field, a force is exerted on the wire.
Second Right-Hand Rule – Electromagnetism
Second Right-Hand Rule. When a current flows through a conductive wire, a non-visible effect called the electromagnetic field is generated around it.