Coulomb's Law involves two kinds of mathematical relationships that describe how the electric force is affected by the # of charged particles, and the distance between the two particles.

1. The electric force varies directly to the amount of the charges
2. The electric force varies indirectly to the square of the distance between charges.

Coulomb's Law equation expressed as a proportionality is:

Charge1 x Charge2

F

Electric --------------------------

distance2

Check your understandingAnswer these on the WB's.

A1-Two charged objects have a repulsive force of 0.080 N. If the charge of one of the objects is doubled, then what is the new force?

A2-Two charged objects have a repulsive force of 0.080 N. If the charge of both of the objects is doubled, then what is the new force?

B3-Two charged objects have a repulsive force of 0.080 N. If the distance separating the objects is doubled, then what is the new force?

B4- Two charged objects have a repulsive force of 0.080 N. If the distance separating the objects is tripled, then what is the new force?

B5-Two charged objects have an attractive force of 0.080 N. If the distance separating the objects is quadrupled, then what is the new force?

B6-Two charged objects have a repulsive force of 0.080 N. If the distance separating the objects is halved, then what is the new force?

C7-Two charged objects have a repulsive force of 0.080 N. If the charge of one of the objects is doubled, and the distance separating the objects is doubled, then what is the new force?

C8- Two charged objects have a repulsive force of 0.080 N. If the charge of both of the objects is doubled and the distance separating the objects is doubled, then what is the new force?

C9-Two charged objects have an attractive force of 0.080 N. If the charge of one of the objects is increased by a factor of four, and the distance separating the objects is doubled, then what is the new force?

C10- Two charged objects have an attractive force of 0.080 N. If the charge of one of the objects is tripled and the distance separating the objects is tripled, then what is the new force?