- #1
Aleksandre
- 11
- 0
Homework Statement
Two parallel very long threads are uniformly charged with linear charge density of 10-8 C/cm . Distance between them is 15 cm. Find electric field vector at a distance of 15 cm from both threads.
Homework Equations
E*dA=Qenclosed/permittivity of free space
The Attempt at a Solution
So I assumed that the electric fields created by each thread would be equal as they have same characteristics. So to solve the problem I just had to find electric field created by a long thread. To solve it, I used Gaussian law (enclosed the thread with a cylinder of radius R=15cm and length L), the equation above which led me to:
E*2pi*R*L=Qenclosed/epsilon where Qenclosed = charged density lambda * L
E*2pi*R*L = lambda * L / epsilon
Uknown Ls cancel out, R is a intial distance 0.15 m so I can solve for E. The final electric field found, will be same for second thread as well. Is this solution correct?