Electric Forces: Need Help Solving!

AI Thread Summary
The discussion focuses on calculating the electric force between two charged spheres and comparing it to their weight. The electric force is determined using Coulomb's law, resulting in a value of 0.0146 N. The user attempts to find the ratio of the electric force to the weight of one sphere, calculating it as approximately 0.523. There is uncertainty about the accuracy of the calculations and a request for verification of the approach taken. The thread highlights the need for clarity in applying physics formulas to solve electric force problems.
BuBbLeS01
Messages
602
Reaction score
0
Electric Forces...need help!

Homework Statement


Two small plastic spheres each have a mass of 2.85 g and a charge of -39 nC. They are placed 3.06 cm apart (center to center).

A. What is the magnitude of the electric force on each sphere?

B. By what factor is the electric force on a sphere larger than its weight?


Homework Equations





The Attempt at a Solution


A. K*q*q / r^2 = 0.0146 N
B. I thought I could just do 0.0146 N / (0.00285kg * 9.81 m/s^2) = 0.523...is that right?
 
Physics news on Phys.org
The concept is right.
 
so what am I doing wrong??
 
Are you? What? I haven't checked the numbers.
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Similar threads

Find the magnitude of the electric force from 3 charges at vertices of a cube
Replies
17
Views
2K
Two spring-coupled masses in an electric field (one of the masses is charged)
Replies
1
Views
919
Force needed to hold together a capacitor
Replies
4
Views
1K
Understanding the electric force felt by the charges on a sphere
Replies
1
Views
1K
Calculating electric flux when given a charge (Gauss)
Replies
14
Views
2K
Electric Flux through Cubical Surface Enclosing Sphere
Replies
2
Views
4K
Electric Field Force Exerted Vertically
Replies
9
Views
8K
Why is source force + electrostatic force = 0 inside battery?
Replies
10
Views
1K
Calculate electric force using Coulomb's law (vector components are the struggle)
Replies
3
Views
1K
Electric Forces and net electric force?
Replies
7
Views
4K

Hot Threads

Recent Insights

Back
Top