29CHAPTER OUTLINE29.1 Magnetic Fields and Forces29.2Magnetic Force Acting on aCurrent-Carrying Conductor29.3Torque on a Current Loop ina Uniform Magnetic Field29.4Motion of a Charged Particlein a Uniform Magnetic Field29.5Applications InvolvingCharged Particles Moving ina Magnetic Field29.6The Hall EffectMagnetic FieldsANSWERS TO QUESTIONSQ29.1The force is in the +ydirection. No, the proton will notcontinue with constant velocity, but will move in a circularpath in the x-yplane. The magnetic force will always beperpendicular to the magnetic field and also to the velocity ofthe proton. As the velocity changes direction, the magneticforce on the proton does too.Q29.2If they are projected in the same direction into the samemagnetic field, the charges are of opposite sign.Q29.3Not necessarily. If the magnetic field is parallel or antiparallelto the velocity of the charged particle, then the particle willexperience no magnetic force.
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