Question

What is the mathematical equation for the electric force between two charges? Identify each variable.
@vocaloid

Answer 1

\[F _{e} = \frac{ k q _{1} q _{2}}{ r ^{2}}\]

Answer 2

Have you seen it before?

Answer 3

Yes it looks familiar

Answer 4

Think you can infer what each variable represents?

Answer 5

k =energy?

Answer 6

What does F usually stand for in physics?

Answer 7

force

Answer 8

Since we’re looking for a formula that gives us the electric force between TWO charges, that’s what Fe stands for.

Answer 9

oh okay

Answer 10

k is a bit difficult to guess unless you have read about Coulombs Law. But k is a constant that represents the medium that the charges are within. Most cases you deal with are air, thus you’ll be using the value of:

\[k = 9 \times 10^{9}\]

Answer 11

Now what could q represent?

Answer 12

change?

Answer 13

Correct, q1 and q2 represent the two charges in the equation. Note that you will sometimes come across problems where the two charges are the same. In such an event, replace them with q^2

Answer 14

Now, what about r?

Answer 15

position?

Answer 16

Close, but it’s a different term.

Answer 17

um delta?

Answer 18

It has to do with the position of the two charges, in relation to each other.

Answer 19

oh so q is the position of the two charges, in relation to each other.

Answer 20

q is the value of each charge

Answer 21

i meant r

Answer 22

Mhm, r represents the distance between the two charges.

Answer 23

Note that the electrical force is directly proportional to the charge, and has an inverse square relationship with the distance.

Answer 24

Increase the charge by a factor of 3, the force will increase by a factor of 3. Increase the distance by a factor of 3, and the force will decrease by a factor of 9.

Answer 25

so the charge will have a parallel charge , and for distance it will be inverse?

Answer 26

Yes, the charge has a directly proportional relationship and the distance has an inverse square relationship with the force.

Answer 27

Got it! Wow, you are a great help

Answer 28

Cool, and no problem. Glad I could help :)

Answer 29

Describe the direction of the electric force between two opposite charges, between two like charges, and when a charge is in an electric field.

Answer 30

This would be the answer right ---> charge has a directly proportional relationship and the distance has an inverse square relationship with the force.

Answer 31

No, this just has to do with the nature of charges and the vector of the force. Have you ever used magnets before?

Answer 32

Yes

Answer 33

What happens when two magnets of opposite charges are put close together?

Answer 34

they stick

Answer 35

when the same charge magnets are put together they repel

Answer 36

Yes. When charges that are opposite are put close together, there is an attractive force between them. When charges that are both positive or negative are put close together, there is a repulsive force.

Answer 37

Whenever the force is positive, it is repulsive in nature. That’s because if you multiply a positive by a positive and a negative by a negative, you get a positive number. Thus the charges would be of the same type, and be repulsive.

For a negative force, the charges are always opposite, as that is the only way you get a negative when multiplying, and you would get an attractive force.

Answer 38

Sorry I was afk

Answer 39

Thank you so much !

Answer 40

Yeah, the general gist for you question is positive is outward and negative is inward, as far as the force goes.

Answer 41

Pretty simple to remember ! =)

Answer 42

Haha yeah, good luck with your assignment