Electric flux through a cube

  • Thread starter kirby2
  • Start date
  • #1
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A point charge 6.50 nC is at the center of a cube with sides of length 0.260 m.

PART A: What is the electric flux through the surface of the cube?

PART B: What is the electric flux through one of the six faces of the cube?

ATTEMPT:

A)
Total flux enclosed by the cube = Q / eo
6.5E-9/8.85 x 10^-12= 734.5

B)
flux through one of the six faces is
= Q / 6 eo
so 734.5/6 = 122.4

with the exception of units, are these right? i think i'm doing it wrong because i didn't use the side length in any of the calculations.
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
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hi kirvy2! :wink:
… i think i'm doing it wrong because i didn't use the side length in any of the calculations.
no, your method is fine :smile:
 
  • #3
BruceW
Homework Helper
3,611
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Agreed. It is one of the interesting things about the Coulombic force :) Maybe they were throwing you a red herring by giving you the length of the sides.
 

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