Document Sharing User Settings Course Tools 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 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. 1. Note the direction of v and B, and find the angle a between them.(Figure 1) 2. The force is perpendicular to the plane containing and B. The direction of F is given by the right-hand rule. (Figure 2) 3. For a negative charge, the force is in the direction opposite that predicted by the right hand rule. (Figure 3) 4. The magnitude of the force is given by Part A F = |q|vB sin a or F= |q|vB. Figure v A vertical wire carries current in the upward direction. An electron is traveling parallel to the wire. What is the angle a between the velocity of the electron and the magnetic field Express your answer in degrees. View Available Hint(s) a = 90 degrees Submit Previous Answers Part B Correct In what direction is the force exerted by the magnetic field on the electron? F is parallel to the wire and points upward. Fis parallel to the wire and points downward. F is perpendicular to the wire and points toward the wire. Fis perpendicular to the wire and points away from the wire. Submit Previous Answers Correct 1 of 3 Part C If the magnetic field of the wire is 4.010-4 T and the electron moves at 1.0107 m/s, what is the magnitude F of the force exerted on the electron? Express your answer in newtons to two significant figures. F = Submit Request Answer ? N The unit of current, the ampere, is defined in terms of the force between currents. Two 1.0-meter-long sections of very long wires a distance 1.5 m apart each carry a current of 1.0 A. Part A What is the force between them? (If the force between two actual wires has this value, the current is defined to be exactly 1 A.) Express your answer with the appropriate units. ? F= 1 10 7 N Submit Previous Answers Request Answer