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A group of particles is traveling in a magnetic field of unknown magnitude and direction. You...

A group of particles is traveling in a magnetic field of unknown magnitude and direction. You observe that a proton moving at 1.70 km/s in the +x-direction experiences a force of 2.06×10−16 N in the +y-direction, and an electron moving at 4.60 km/s in the −z-direction experiences a force of 8.20×10−16 N in the +y-direction.

A. What is the magnitude of the magnetic field?

ans 1.35 T

B. What is the direction of the magnetic field? (in the xz-plane)

ans 55.8 deg

C. What is the magnitude of the magnetic force on an electron moving in the −y-direction at 3.50 km/s ?

7.54×10−16

  N

D. What is the direction of this the magnetic force? (in the xz-plane)

need help on part D

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