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An electron is projected with velocity \( v_{0} \) in a uniform electric field \( E \) perpendicular to the field. Again it is projetced with velocity \( v_{0} \) perpendicular to a uniform 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 \( \frac{r_{1}}{r_{2}} \) is equal to
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