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A particle of charge q, mass m, and speed v enters a uniform magnetic field of magnitude B that is directed down the page as shown.

If the particle enters the field at a 30-degree​ angle as shown, what is the radius of the circular path the particle makes?

A

0

B

${\dfrac{\sqrt{3}mv}{2qB}}$

C

${\dfrac{mv}{2qB}}$

D

${\dfrac{2qB}{mv}}$

E

$\sqrt{\dfrac{2mv}{qB}}$

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