An infinitely long thread is charged uniformly with a linear charge density τ = 6.3 · 10⁻⁷C / m. Find the work of the field forces A by moving a point charge q = 2.1nC from a distance a = 2.4 cm to a distance b = 4.8 cm from the thread.

Thank you for your purchase. If you have any questions, then write to the mail (see "Seller Information")