F) Coulomb's Law for two fixed point charges
r = distance between charges
| F = | k | q1 | q2 |
| (N) | r2 | ||
F - mutual force of attraction or repulsion
k - electrostatic constant -
8.99 x 109 Nm2/C2
(p. 1 Reference)
q - charge of each object
Ex) What is the electrical force between 2 very small objects located .50 m apart when the charge on one object is 4.0 x 10-8 C and the charge on the second object is 6.0 x 10-5 C
Ex) What is the electrical force between 2 very small objects located .50 m apart when the charge on one object is 4.0 x 10-8 C and the charge on the second object is 6.0 x 10-5 C
r = .50 meters
q1 = 4.0 x 10-8 C
q2 = 6.0 x 10-5 C
k = 8.99 x 109 Nm2/C2
(p. 1 Reference)
| F = | k | q1 | q2 |
| (N) | r2 | ||
| F = | (8.99 x 109 Nm2/C2) | (4.0 x 10-8 C) | 6.0 x 10-5 C |
| (N) | (.50 m)2 | ||
F = 8.6 x 10–2 Newtons
Relationships
| F = | k | q1 | q2 |
| (N) | r2 | ||
F,r
Inverse Square
Relationship between
F and
r?
F would be 1/4 as great
F,q
?
| F = | k | q1 | q2 |
| (N) | r2 | ||
Direct
Two charges attract each other with a force of F. If one charged was doubled and the other charge was tripled, how would that change the attractive force between these charges?
| F = | k | q1 | q2 |
| (N) | r2 | ||
Force increases 6 times