Electric Field of a Straight Wire at a Particular Distance from Wire

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SUMMARY

The discussion focuses on calculating the electric field (E) of a straight wire at a specific distance using the formula dE=kdQ/r^2. The integration process involves substituting variables and evaluating the integral from y=0 to L/2, resulting in the expression E=2kλ/(x(sin(arctan(y/x)))). The final formula incorporates constants and variables such as λ (linear charge density) and L (length of the wire), emphasizing the relationship between these parameters and the electric field strength at a given distance from the wire.

PREREQUISITES
  • Understanding of electric field concepts and equations
  • Familiarity with calculus, specifically integration techniques
  • Knowledge of trigonometric functions and their applications in physics
  • Basic principles of electrostatics and charge distribution
NEXT STEPS
  • Study the derivation of electric fields from continuous charge distributions
  • Learn about the application of integration in electrostatics problems
  • Explore the use of trigonometric substitutions in calculus
  • Investigate the implications of linear charge density (λ) on electric field calculations
USEFUL FOR

Students and educators in physics, particularly those focusing on electrostatics and electric fields, as well as anyone involved in solving complex integration problems related to charge distributions.

The Head
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Homework Statement


See attached document


Homework Equations


dE=kdQ/r^2
Ex=Ecos∅

The Attempt at a Solution


dE=kdQ/r^2
E=kλ∫dy/(x^2+y^2) (integrating from y= -L/2 to L/2)
Ex=2kλ∫xdy/(x^2+y^2)^3/2 (change integration to y= 0 to L/2, multiplying expression by 2)

Let y=xtan∅
dy=x(sec∅)^2 d∅

=2kxλ∫x(sec∅)^2/x^3(sec∅)^3 d∅
=2kλ/x∫cos∅ d∅
=2kλ/x(sin∅)
=2kλ/x(sin(arctan(y/x)) (evaluated from y=0 to y=L/2)
=2kλ/x(y/(x^+y^2)^1/2 (evaluated from 0->L/2)
=2kλ/x(L/2)(x^2+(L^2)/4)^.5
=((1.8X10^10)λL/(2x))*(1/x^2+(L^2)/4)^.5)

I would appreciate any help or guidance!
 
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Hi The Head! :smile:
The Head said:
See attached document

erm :redface:

what attached document? :biggrin:

(and please use the X2 and X2 buttons just above the Reply box :wink:)
 

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