Tactics Box 24.2 Determining the Magnetic Force on a Moving Charged Particle Lea

Question

Tactics Box 24.2 Determining the Magnetic Force on a Moving Charged Particle Learning Goal: To practice Tactics Box 24.2 Determining the magnetic force on a moving charged particle. When a particle of charge q moves with a velocity v in a magnetic field B , the particle is acted upon by a force F exerted by the magnetic field. To find the direction and magnitude of this force, follow the steps in the following Tactics Box. Keep in mind that the right-hand rule for forces shown in step 2 gives the direction of the force on a positive charge. For a negative charge, the force will be in the opposite direction. TACTICS BOX 24.2 Determining the magnetic force on a moving charged particle Note the direction of v and B , and find the angle between them.(Figure 1) The force is perpendicular to the plane containing v and B . The direction of F is given by the right-hand rule.(Figure 2) For a negative charge, the force is in the direction opposite that predicted by the right hand rule.(Figure 3) The magnitude of the force is given by F=|q|vBsin or F=|q|vB. Part A A vertical wire carries current in the upward direction. An electron is traveling parallel to the wire. What is the angle between the velocity of the electron and the magnetic field of the wire? Express your answer in degrees.

Explanation / Answer

the angle alpha between the velocity of the electron and the magnetic field of the wire is 90 degrees

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