What Is the Electric Field Near a Charged Rod?

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Homework Help Overview

The discussion revolves around calculating the electric field near a charged rod, specifically focusing on a rod of length 0.4 m with a total charge of 2.6 nC. Participants are examining the correctness of an equation provided for determining the electric field at a point 1 cm from the midpoint of the rod.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants are questioning the validity of the equation used to calculate the electric field and are seeking clarification on its derivation. There is a focus on understanding the correct application of the formula and whether it has been applied correctly in the calculations presented.

Discussion Status

The discussion is ongoing, with some participants expressing doubt about the correctness of the equation and calculations. There is an indication that one participant has acknowledged the equation's validity but suggests that deriving it independently would be more beneficial than merely substituting values.

Contextual Notes

Participants are navigating through the implications of using a specific formula for electric fields and the importance of understanding its derivation. There is a sense of uncertainty regarding the application of the equation in the context of the problem.

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Homework Statement


If the total charge on a rod of length 0.4 m is 2.6 nC, what is the magnitude of the electric field at a location 1 cm from the midpoint of the rod?

Homework Equations


[(2QK)/(Y)](1/sqrt(L^2 + 4[(Y)^2]), K = 8.99E9

I don't know if the above equation is actually correct.

The Attempt at a Solution



[2(2.6E-9)(8.99E9) / (0.01)] * 1 / sqrt(0.4^2 + 4(0.01^2)]

= 11700 N/CCan anyone check if this is correct? I don't think it's correct.
 
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DeadFishFactory said:
[(2QK)/(Y)](1/sqrt(L^2 + 4[(Y)^2]), K = 8.99E9

I don't know if the above equation is actually correct.

I don't think it's correct. How did you get it?
 
Oops, I made a mistake. That equation is actually right, but you should derive it yourself rather than just plugging numbers into an equation.
 

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