Types of Fields
This type of field is created by a charged object and exerts a force on other charged objects.
electric field
In this type of material, electrons move freely.
conductor
Rubbing a balloon on your hair charges it through this method.
friction
As the distance between two charged objects increases, the electric force between them does this.
decrease
This field surrounds a mass and affects other masses.
gravitational field
In this type of material, electrons are tightly bound and do not move easily.
insulator
Charging an object without touching it involves this method.
induction
Increasing this component of an electromagnet increases its magnetic strength.
number of turns of wire
This field is generated by moving electric charges or magnets.
magnetic field
Charges are redistributed on the surface of this kind of material.
conductor
Charging by direct contact is known as this method.
conduction
The strength of a magnetic field can increase by using more of these energy sources.
batteries
The field lines for this type of field always point toward the center of mass.
gravitational field
These materials are used to prevent electric currents from escaping.
insulators
This method can result in both objects becoming oppositely charged after being rubbed.
friction
The force between magnets can be changed by varying this internal metal component.
size of the iron core
This field can exert a force on a current-carrying wire placed within it.
magnetic field
When a conductor is connected to the Earth, excess charges flow here.
ground
This method requires a ground connection and no physical contact with the charged object.
induction
This law explains the inverse-square relationship between electric force and distance.
Coulomb's law