Electric Forces with particles and Columbs law problem.

AI Thread Summary
The discussion revolves around calculating electric forces using Coulomb's law for two charged particles. The first part of the problem, involving charges of -7.13 × 10^-6 C and 1.87 × 10^-6 C separated by 0.0284 meters, yields a force of 148.7 N. For the second part, the challenge is to determine the charge q3 of two identical positive particles that exert the same force when separated by the same distance. Despite attempts to solve for q3 using the formula Fe = kq3^2/r^2, the calculated value of 3.6 x 10^-6 C is deemed incorrect. The issue may relate to significant figures or calculation errors, as participants suggest verifying the precision of the answer.
Toon
Messages
10
Reaction score
0

Homework Statement


Two particles, one with charge -7.13 × 10-6 C and one with charge 1.87 × 10-6 C, are 0.0284 meters apart. What is the magnitude of the force that one particle exerts on the other?
Two new particles, which have identical positive charge q3, are placed the same 0.0284 meters apart, and the force between them is measured to be the same as that between the original particles. What is q3?

Homework Equations


Fe=Kq1*q2 /r^2

The Attempt at a Solution


So for the first part. I got the answer right for the force which was 148.7 N. However for the second part, I tried doing Fe= kq3^2/r^2 and solved for q3. However I keep getting 3.6 x 10 ^-6 columbs and that's wrong according the my physics homework website. Any help where I am going wrong?THanks!
 
Physics news on Phys.org
Could it be that you are not expressing your answer to the correct number of significant figures?
 
TSny said:
Could it be that you are not expressing your answer to the correct number of significant figures?
thats what I am thinking. However I've tried diffrent ways of expressing the answer and its still wrong so I am assuming my numbers might be off.
 
What do you get to 3 significant figures?
 
TSny said:
What do you get to 3 significant figures?
3.651 x 10 ^-6 but the answer is still wrong
 
Well, your answer certainly looks correct to me.
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Correct statement about a reservoir with an outlet pipe'

Thread 'Correct statement about a reservoir with an outlet pipe'

The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
View full post »

Similar threads

Calculate electric force using Coulomb's law (vector components are the struggle)
Replies
3
Views
1K
Find the magnitude of the electric force from 3 charges at vertices of a cube
Replies
17
Views
2K
The vector sum of the electric forces exerted on a particle
Replies
3
Views
3K
Electric Charge and Force free body diagrams
Replies
1
Views
4K
How to find distance between 2 charges, with no force given?
Replies
2
Views
2K
Electrostatic Force and Field between two charges
Replies
5
Views
2K
Electrostatics: Gauss' Law Problem Finding the Flux through a Conducting Spherical Shell
Replies
9
Views
2K
Three charges located on a straight line
Replies
7
Views
9K
Component Force on a 1.0 nC Charge
Replies
2
Views
10K
Electric field at the center of the equilateral triangle
Replies
10
Views
3K

Hot Threads

Recent Insights

Back
Top