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

F=qbBsinθ

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

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

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.

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 radius of the satellite

The line that bisects the line connecting the charges.