The quantity of unbalanced positive or negative ions in or on an object; measured in coulombs.

like charges repel each other, unlike charge attract each other.

N and S

a collection of vectors, one at each point in space, that determines the magnitude and direction of the gravitational force.

is a coil wound into a tightly packed helix

The region in which a force is exerted on an electric charge. The electric force per unit positiv charge; unit is N/C.

the standard unit of electric charge : symbol C

like sides repel each other, unlike sides attract each other.

the magnitude of the gravitational field vector at a point in space.

right-hand rule

the value, in volts, of potential energy per unit positive charge for a given point in an electric field; 1V= 1J/C

ε=kq2/r^2

a vector field that describes the magnetic influence of electric charges in relative motion and magnetized materials.

Gm1m2/r^2

moving electric chargers produce a magnetic field.

the amount of work required per unit charge to move a positive charge from one point to another in the presence of an electric field,

Kq1q2/r^2

is one of two ways that the intensity of a magnetic field can be expressed. Technically, a distinction is made betwee-n magnetic field strength H, measured in amperes per meter (A/m), and magnetic flux density B, measured in Newton-meters per ampere (Nm/A), also called teslas (T).

the orbit around Earth of an object with an orbit soeed matching the rate of Earth's rotation; the period of such an orbit is exactly one Earth day.

q=mg△d/△V

the energy stored in a system of two charges a distance delta D apart, or the energy stored in an electric field that can do work on a positively charged particle,

the magnitude of the electric charge carried by a proton, equal to the absolute value of the electric charge of an electron.

F=qbBsinθ

The radius of the satellite

The line that bisects the line connecting the charges.