Electromagnetism - Linear charge

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Homework Help Overview

The discussion revolves around a problem in electromagnetism involving a linear charge, where the original poster presents various parameters such as charge, distance, velocity, and force. The context suggests a focus on electric fields and potential differences related to charged objects.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants question the clarity of the problem statement and the specific scenario being analyzed. There is a discussion about the nature of the charged object and the assumptions regarding its configuration. Some participants express confusion about the calculations and seek clarification on the correct interpretation of the problem.

Discussion Status

The discussion is ongoing, with participants providing feedback on the original poster's calculations and assumptions. There is an acknowledgment of the need for a clearer problem statement, and some guidance has been offered regarding the interpretation of the charge distribution.

Contextual Notes

Participants note the importance of defining the scenario accurately, particularly regarding the type of charge distribution (e.g., line charge vs. other configurations) and the implications for the calculations involved.

Jon Blind
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Homework Statement



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q=1.602*10^-19 point 1

L=1mm=r1

v=1.1*10^6 at point 2

F=1.44*10^-12 at point 1

Homework Equations


E=(1/4πε)*(q/r)

ΔV=∫E*dr=(1/4πε)*q∫(1/r)=(1/4πε)*q*ln (r2/r1)

ΔU=ΔK=mv^2/2

ΔK=mv^2/2=ΔV*q=q*(1/4πε)*Q*(ln(r2/r1))

Q=F/E=1.44*10^-12/(q(4*pi*epsilon*(1.00*10^-3)^2))=1.00*10^-9

The Attempt at a Solution

mv^2/2=ΔV*q=q*(1/4πε)*Q*(ln(r2/r1))

r2=0.002m

IS this correct?
 
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Your problem statement doesn't actually state a problem. What is to be analyzed or found?

What is the description of the scenario? Is that vertical charged rectangle meant to represent a short charged plate, part of in infinite plane of charge, a section through a disk of charge, or maybe just a short charged line segment? Something else?

Please provide a complete problem statement.
 
Sorry but you have to calculate the length from position 1 to position 2. It's an infinite linecharge.

I can't understand where I went wrong in my calculations.
 
It's correct assuming v(L) = 0 and Q = line charge linear density which is usually written as λ and which has dimensions of QL-1, not Q.

PS did not check math.
 

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