A charged particle is moving perpendicularly to a magnetic field B. Fill in the

Question

A charged particle is moving perpendicularly to a magnetic field B. Fill in the blank indicating the direction for the quantity missing in each option.

Use the diagram above for the directions of the various axes.
                                                      +x                                                                               -x                                                                               +y                                                                               -y                                                                               +z                                                                               -z                                              Negative Charge, Velocity: ???, B-Field: -z, Force: +y
                                                      +x                                                                               -x                                                                               +y                                                                               -y                                                                               +z                                                                               -z                                              Positive Charge, Velocity: +y, B-Field: ???, Force: -z
                                                      +x                                                                               -x                                                                               +y                                                                               -y                                                                               +z                                                                               -z                                              Positive Charge, Velocity: +y, B-Field: -z, Force: ???

A charged particle moves through a velocity selector at a constant speed in a straight line. The electric field of the velocity selector is 3.61E+3 N/C, while the magnetic field is 0.397 T. When the electric field is turned off, the charged particle travels on a circular path whose radius is 4.03 cm. Calculate the charge-to-mass ratio of the particle.

The solar wind is a thin, hot gas given off by the sun. Charged particles in this gas enter the magnetic field of the earth and can experience a magnetic force. Suppose a charged particle traveling with a speed of 9.08E+6 m/s encounters the earth's magnetic field at an altitude where the field has a magnitude of 1.30E-7 T. Assuming that the particle's velocity is perpendicular to the magnetic field, calculate the radius of the circular path on which the particle would move if it were an electron.

A charged particle is moving perpendicularly to a magnetic field B. Fill in the blank indicating the direction for the quantity missing in each option. Use the diagram above for the directions of the various axes. Negative Charge, Velocity: ???, B-Field: -z, Force: +y Positive Charge, Velocity: +y, B-Field: ???, Force: -z Positive Charge, Velocity: +y, B-Field: -z, Force: ??? A charged particle moves through a velocity selector at a constant speed in a straight line. The electric field of the velocity selector is 3.61E+3 N/C, while the magnetic field is 0.397 T. When the electric field is turned off, the charged particle travels on a circular path whose radius is 4.03 cm. Calculate the charge-to-mass ratio of the particle. The solar wind is a thin, hot gas given off by the sun. Charged particles in this gas enter the magnetic field of the earth and can experience a magnetic force. Suppose a charged particle traveling with a speed of 9.08E+6 m/s encounters the earth's magnetic field at an altitude where the field has a magnitude of 1.30E-7 T. Assuming that the particle's velocity is perpendicular to the magnetic field, calculate the radius of the circular path on which the particle would move if it were an electron.

Explanation / Answer

1.

Assuming that the +z direction is out of the page ( towards the viewer )
And assuming that the particle is positive - you definitely should have been told this
1)

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