An infinite line of charge has a linear charge density of
10⁻⁷ C/m. What will be the magnitude of the force acting on an alpha particle placed at a distance of 4cm from the line of charge?

A. 4× 10⁻¹¹ N
B. 8× 10⁻¹¹ N
C. 1.6× 10⁻¹⁰ N
D. 3.2× 10⁻¹⁰ N