In a certain region of space there exists a constant and uniform magnetic field of induction B. The width of the magnetic field is a. A charged particle having charge q is projected perpendicular to B and along the width the field. If deflection produced by the fiel perpendicular to the width is d, then the magnitud of the momentum of the particle is,

Options

A. `((d^(2)+a^(2)))/(2d)qB`
B. `(a^(2))/(2d^(2))qB`
C. `(4d^(2))/((a+d))qB`
D. `((a^(2)-d^(2)))/(2d)qB`

Answer

a