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A particle with a charge of +3e and a mass of 1.7E-21 kg is traveling right...

A particle with a charge of +3e and a mass of 1.7E-21 kg is traveling right to left and enters a region of space moving at 150 m/s, where a uniform magnetic field exists (see figure). Once in the field, the charge follows a circular path where r = 45 cm. What is the magnitude and direction of the magnetic field?

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