A semicircular wire hs a length L and mass M. A paricle of mass m is placed at the centre of the circle. Find the gravitational attraction on the particle due to the wire.
A. `(GM)/(l^(2))` along x- axis
B. `(GM)/(pi l^(2))` along y-axis
C. `(2 pi GM)/(l^(2))` along x-axis
D. `(2 pi GM)/(l^(2))` along y-axis