Module 4 : Electricity and Magnetism Flashcards
what is charge
the property of particles
what types of charges are there (3)
positive
negative
neutral
characteristics of charged particles (2)
They have a electric field around them
When charge particles enter another electrical field it will experience an electrical force (Coulomb force)
what is the unit of charge
Coulomb (C)
what is an electrical conductor
a material through which electrical current flows easily
what is an electrical insulator
a material with very high resistance to the flow of electrical current
what is static electricity
imbalance of electric charges within or on the surface of a material
when does an electric current occurs
when a electric charges are moving from one place to another
how can materials become electrically charged (3)
friction
induction
contact with another charged object
what happens when two objects of the same charge interact
they repel
what happens when two objects of different charges interact
they attract
what are the rules with electric fields (5)
Electric fields exists around charged particles
Where the lines are closest the field is strongest
Field lines never cross
Lines are directed, positive to negative
Field lines are perpendicular to the surface of the charged object
what is electric field strength
the force per unit charge on a small positive test charge positioned in the field
what unit is electric field strength measured in
NC⁻¹
what is the equation for electrical field strength
E = F/q
