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A proton (mass = 1.67 x 10-27 kg, q = 1.60 x 10-19 C) enters a...

A proton (mass = 1.67 x 10-27 kg, q = 1.60 x 10-19 C) enters a magnetic field of 0.72 T with an initial speed of 2.0 x 104 m/s. What is the radius of the circle which it bends into?

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