Question

@matt101 Last Two Electricity Problems

Answer 1

How do you think you could solve #4?

Answer 2

You got it!

Answer 3

How would I rearrange the equation, so I am finding the magnitude?

Answer 4

Yes, you are finding the magnitude of one of the charges

Answer 5

\[65={(9 \times 10^9) \times (6 \times 10^{-6}) \times q_2 \over 0.05^2}\]
How would you isolate q2?

Answer 6

Yup!

Answer 7

@matt101 Is it 108.33 repeating?

Answer 8

Check your math - that's an awfully big charge!

Answer 9

That's it!

Answer 10

Yup

Answer 11

Okay! Thank you so much! How would I do the three parts to number 5?

Answer 12

It's a question of adding forces to come up with the net force. Just use Coulomb's Law as usual!

Answer 13

Really? Wow, nearly all of these used his law!

Answer 14

Would the origin be 0 for A?

Answer 15

@matt101

Answer 16

Yes

Answer 17

Well keep in mind you have 3 charges in this situation. Each particle will experience 2 forces - one as a result of one of the other particles, and one as a result of the OTHER other particle.

This means you'll need to add 2 forces to get the net force on each particle. Each force you can find using Coulomb's Law. Just be careful with the directions of the forces!

Answer 18

Oh gosh. This is confusing already. I get what you're saying but how do I know which numbers to add?