A light charged particle is revolving in a circle of radius 'r' in electrostatic attraction of a static heavy particle with opposite charge. How does the magnetic field 'B' at the centre of the circle due to the moving charge depend on 'r' ?

Options

A. `B prop (1)/(r)`
B. `B prop (1)/(r^(2))`
C. `B prop (1)/(r^((3)/(2)))`
D. `B prop (1)/(r^((5)/(2)))`

Answer

D