An infinite line of charge with linear density λ = 8.8 μC/m is positioned along the axis of a thick insulating shell of inner radius a = 2.9 cm and outer radius b = 4.1 cm. The insulating shell is uniformly charged with a volume density of ρ = -659 μC/m3.
What is λ2, the linear charge density of the insulating shell?
What is Ey(P), the value of the y-component of the electric field at point P, located a distance 8.4 cm along the y-axis from the line of charge?
E.dA = Q/Epsilon nought
Q=rhow*V in terms of volume charge density
Q=lambda*L in terms of linear charge density
The Attempt at a Solution
λ2 = rhow/Surface Area of the Spherical Shell
λ2 = -659 μC/m3 * 4*pi* .041^2 = -13.9 μC/m
but this is wrong! why?