Given:
Charge of alpha particle, $q = +2e = 2 \times 1.602 \times 10^{-19}$ C (where $e$ is the elementary charge)
Mass of alpha particle, $m = 6.68 \times 10^{-27}$ kg
Magnetic field, $B = 0.20$ T
Final orbit radius, $r = 0.90$ m
We need to find the period of
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