An electron having kinetic energy $T$ is moving in a circular orbit of radius $R$ perpendicular to a uniform magnetic induction $\vec B$ . If kinetic energy is doubled and magnetic induction tripled, the radius will become
An electron having kinetic energy $T$ is moving in a circular orbit of radius $R$ perpendicular to a uniform magnetic induction $\vec B$ . If kinetic energy is doubled and magnetic induction tripled, the radius will become
- A
$\frac{{3\,R}}{2}$
- B
$\sqrt {\frac{3}{2}} \,R$
- C
$\sqrt {\frac{2}{9}} \,R$
- D
$\sqrt {\frac{4}{3}} \,R$
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