Formula
What is Coulomb's Law formula??
Fe=K[q1q2]/d2
What is the unit of Electrical force?
Newtons (N)
A negative charge of -4.0 C and a positive charge of 3.0C are separated by 60 m. What is the force between the two charges?
Fe=K[q1q2]/d2
Fe=(8.99x109)[(4)(3)]/(60)2
Answer=29966666.67N
If q1 doubles what is the new force?
1e=1[2112]/12
=2Fe
What is Coulomb's constant?
8.99x109
A negative charge of -6 C and a positive charge of 9 C are separated by 100 M. What is the total force between two charges?
Fe=K[q1q2]/d2
Fe=(8.99x109)[(6)1(6)2]/(100)2
Fe=32364000N
Does d always have an exponent? And if it positive or negative?
Yes d does have an exponent and it is positive.
What are the charges symbol?
q1 and q2
Two negative charges that are both -6 C push each other apart with a force of 20N. How far apart are the two charges?
Fe=K[q1q2]/d2
d2=(8.99x109)(6)(6)/20
=(1.62x101)2
=4.02M
If d quadruples what is the new force?
1e=1[1112]/42
=1/16
What is d unit?
Meters
A negative charge of -0.005 experts and an attractive force of 10.0 N on the second charge that is 10 m away. What is the magnitude of the second charge?
Fe=K[q1q2]/d2
(10)(10)2/(8.99x109)(.0051 )(q2 )
=2.225x10-5 C
Which of these forces is stronger?
Fe=K[q1q2]/d2 ---> Eletromagntic force
Fg=Gm1m2/r2 ---> Graventainal force
Electromagnetic force because it has a bigger constant
(But the distance is the same because they go on forever.)
What do the absolute bars mean?
This means writing the number as a positive charge even if it is negative.
(Don't take away the negative in the exponent!!)
A negative charge of -6x10-5 C and a positive charge of 7x10-5 C are separated by .16 m. What is the force between the two charges?
Fe=K[q1q2]/d2
Fe=(8.99x109)[(-6x10-5)(7x10-5)]/(.16)2
Fe=1474.92N