An electron is projected with velocity `v_(0)` in a unifrom electric field E perpendicular to the field Again it is projectced with velocity `v_(0)` perpendicular to a unifrom magnetic field `B .` if `r_(1)` is initial radius of curvature just after entering in the electric field and `r_(2)` is initial radius of curvature just after entering in magnetic field then the ratio `r_(1)//r_(2)` is equal to .

Options

A. `(Bv_(0)^(2))/(E)`
B. `(B)/(E)`
C. `(Ev_(0))/(B)`
D. `(Bv_(0))/(E)`