A circular ring of radius R with uniform positive charge density `lambda` per unit length is located in the y-z plane with its centre at the origin O. A particle of mass m and positive charge q is projected from the point P `(Rsqrt3, 0, 0)` on the positive x-axis directly towards O, with an initial speed v. Find the smallest (non-zero) value of the speed v such that the particle does not return to P.

Options

A. The particle crosses O and goes to infinity
B. The particle returns to P
C. The particle will just reach O
D. The particle crosses O and goes to `-Rsqrt(3)`

Answer

C