Line Charge Density of 30uC/7.0m Wire: Answer & Explanation

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SUMMARY

The discussion focuses on calculating the line charge density of a straight wire that is 7.0 meters long and carries a total charge of 30 microcoulombs (30 µC). The line charge density (λ) is determined using the formula λ = Q/L, where Q is the total charge and L is the length of the wire. Substituting the values, λ = 30 µC / 7.0 m results in a line charge density of approximately 4.29 µC/m. The discussion highlights the importance of correctly applying the formula for line charge density in electrostatics.

PREREQUISITES
  • Understanding of electrostatics principles
  • Familiarity with charge density concepts
  • Knowledge of basic physics equations related to electric fields
  • Ability to perform unit conversions (microcoulombs to coulombs)
NEXT STEPS
  • Study the derivation of the line charge density formula λ = Q/L
  • Explore the implications of line charge density on electric field calculations
  • Learn about the electric field generated by charged wires using E = kQ/r
  • Investigate applications of line charge density in real-world scenarios, such as in transmission lines
USEFUL FOR

Students studying physics, particularly those focusing on electromagnetism, as well as educators and anyone interested in understanding charge distribution in conductive materials.

tnutty
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Homework Statement



A straight wire 7.0m long carries 30uC distributed uniformly over its length.
What is the line charge density on the wire?

_____ uC/m


Homework Equations



A) E = 2k/lamda /

B) E = kq/r

some other ones?


The Attempt at a Solution



I sub B into a, and got q/2 = 15. But its not correct. Which formula do I use?
 
Physics news on Phys.org
Neither.

Hint: You're given charge and length and asked to calculate charge per unit length...shouldn't be too hard to figure this one out ;)
 

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