Question

A long straight wire has fixed negative charge with a linear charge density of magnitude 5.2 nC/m. The wire is to be enclosed by a coaxial, thin-walled, nonconducting cylindrical shell of radius 1.8 cm. The shell is to have positive charge on its outside surface with a surface charge density σ that makes the net external electric field is zero. Calculate σ.

Answer 1

@random231 @divu.mkr
You guys have any brilliant thoughts :D

Answer 2

cool question working on it!

Answer 3

2k (lambda) = (sigma)R/ E0
solve this and revert back

Answer 4

if your answer got correct

Answer 5

wats k?

Answer 6

@austinL you know whats k ?

Answer 7

k?

\(8.99\times 10^9~~ Nm^2/C^2\)

Answer 8

yep and k= 1/4pi E0

Answer 9

ok ok i know that !!!

Answer 10

Okay, so evidently the answer is \(45.978\times 10^{-9}~~ C/m^2\)

Answer 11

and it matches with the answer of the equation?

Answer 12

its basically gauss's law again!
see the attachment!

Answer 13

got it? its a bit shortcut!!!

Answer 14

@austinL

Answer 15

Yep, sorry I had some chores to do. Yep, makes sense! Thank you :D