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A charged particle having mass 6.64×10^-27 kg (that of a helium atom) moving at 8.70×10⁵ m/s perpendicular to a 1.50-T magnetic field travels in a circular path of radius 16.0 mm.

(a) What is the charge of the particle?

(b) What is unreasonable about this result?

(c) Which assumptions are responsible?

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