142CHAPTER 19 Answers to Even Numbered Conceptual Questions 2.No. The force that a constant magnetic field exerts on a charged particle is dependent on the velocity of that particle. If the particle has zero velocity, it will experience no magnetic force and cannot be set in motion by a constant magnetic field. 4.The force exerted on a current-carrying conductor by a magnetic field is sinFBIθ=l, where is the angle between the direction of the current and the direction of the magnetic field. Thus, if the current is in a direction parallel ( )0=or anti-parallel ( )180=°to the magnetic field, there is no magnetic force exerted on the conductor. 6.Straight down toward the surface of Earth. 8.The magnet causes domain alignment in the iron such that the iron becomes magnetic and is attracted to the original magnet. Now that the iron is magnetic, it can produce an identical effect in another piece of iron. 10.The magnet produces domain alignment in the nail such that the nail is attracted to the magnet. Regardless of which pole is used, the alignment in the nail is such that it is
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