1.
A very long uniformly charged thread oriented along the axis of a circle of radius R=1mR = 1\,\text{m}, rests on its centre with one of the ends. The charge per unit length on the thread is λ=16ε0\lambda = 16\varepsilon_0. Find the flux of the vector E\vec{E} through the circle area in Vm\text{V}\cdot\text{m}.