A positively charged particle has a velocity in the negative z direction at a certain point P. The magnetic force on the particle at this point is in the negative y direction. Which one of the following statements about the magnetic field at point P can be determined from this data? a. Bx is positive
b. Bz­ is positive
c. By is negative
d. By is positive
e. Bx is negative

B   their speed changed during the 25 minutes.

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