Charges
An object that has no overall charge
neutral
points on a magnet where magnetism is concentrated
poles
opposite charges attract and like charges repel
law of electric charges
substances that can be quickly magnetized even in a weak magnetic field
magnetically soft
protects buildings from lightning strikes
lightning rod
attract
electron spin
the strength of the attraction or repulsion between two charged objects is directly related to the strength of the charges and inversely related to the square of the distance between them
law of electric force
SI unit of charge
Coulomb
early device used to store electric charge
Leyden jar
the flow of charge from one place to another
current
an excess of electrons will cause what type of charge
negative
the total charge is the same before and after and interaction
law of conservation of charge
diverting unwanted electric charge directly into the earth
grounding
bright glow on the end of rod
corona discharge
modern device that stores static electric charge
capacitor
what are 2 ways in which you can magnetize and object
electricity
induction
direct contact
the force between two magnetic poles is directly related to the product of the pole strengths and inversely related to the square of the distance between them
law of magnetic force
What makes iron more magnetic than aluminum
because iron has several unpaired electrons per atom
dry writing used by photocopiers
Xerography
what process occurs when you bring a charged object close to a neutral object and give it a charge
induction
the magnetically soft material placed inside an electromagnet to strengthen it is called what
core
if the electric force between 2 objects is 10 N and the charge of on object is reduced from 10 C to 1.0 C the force attraction or repulsion is reduced this much
1/10 of the original force or 1.0N
this man put a lightning rod on his house to protect it
Benjamin Franklin
temperature at which a ferromagnetic materials domains disappear
Curie Point