- #1
TheRedDevil18
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- 1
Homework Statement
A line charge exists in air along the z-axis between z=0 and z=5 cm. It has a uniform charge density given by:
ρl = 4(uC/m)
Determine E at (0,10 cm, 0)
Homework Equations
The Attempt at a Solution
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I am using gauss law so I draw a cylinder around the wire
Qenc = ρl * L = ∫ D.ds , Gauss law
Qenc = ρl * L , where L is the length of the wire
ds = r*dθ*dz , where r is the distance from the wire to the point, 10 cm
ρl * L = D ∫ 0 to L ∫ 0 to 2pi r*dθ*dz
D = ρl/2pi*r = E*ε
E = ρl / 2pi*ε*r
= (4*10^-6)/(2pi*0.1*8.854*10^-12)
= 7.19*10^5