Ì Grad Ì Undergrad Ì Faculty Ì OtherÌ I have done this pretest/tutorial beforeTutorials in Introductory Physics ©McDermott, Shaffer, & P.E.G., U.Wash.EM-UCO1120044T-PA(MGI)V2b Autumn 2004PRETEST:MAGNETIC INTERACTIONS1. A positively charged particle is located in a region of uniform magnetic field. Determine thedirection of the magnetic force on the particle if it is moving as described in each of the twodiagrams below. If the magnetic force on the particle has zero magnitude, indicate thatexplicitly. Explain.2. The diagrams below show a long, straight wire through which there is a current I. Both a sideview and a top view of the wire are shown. The top-view diagram uses the convention that indicates current out of the page. (Current into the page would be indicated by .) A positively chargedparticle moves to theright at point A, asshown. Label thedirection of themagnetic force on theparticle in each of thetwo diagrams. If themagnetic force on theparticle has zeromagnitude, indicatethat explicitly.Explain.Positively charged particle moving tothe right at A in a uniform magnetic fieldBAvPositively charged particle at rest at Ain a uniform magnetic fieldABPositively charged particle at Ais moving to the rightAvside viewIPositively charged particle at Ais moving to the rightItop viewAvTutorials in Introductory Physics ©McDermott, Shaffer, & P.E.G., U.Wash.EM-UCO1120044T-PA(MGI)V2b Autumn 20043. A second wire carrying current in the same direction as the first is added to the right of thefirst wire and point A. The top view diagram below shows this configuration of wires. As inthe previous question, a positively charged particle moves to the right at point A.a. Determine the direction of the magnetic force on theparticle. Explain.b. When the second wire is added, does the magnitude of themagnetic force on the particle increase, decrease, orremain the same? Explain.4. Now consider a positively charged particle located at point C near the same two wires, asshown below. The particle moves to the right at point C.a. Determine the direction of the magnetic force on the particle.Explain.b. b. When the second wire is added, does the magnitude of themagnetic force on the particle increase, decrease, or remainthe same? Explain.Positively charged particle at Ais moving to the rightItop viewAvIPositively charged particle at Cis moving to the rightItop
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