Question

A line charge with linear charge density λ=10-12 C/m passes through the center of a sphere. If the flux through the surface of the sphere is 1.13×10-3 Vm, what is the radius R of the sphere?

  

Answer 1

$$2\lambda R=\Phi \epsilon_0\\2(\cdot10^{-12})R=(1.13\cdot10^{-3})(8.85\cdot10^{-12})\\R=0.005\ m$$