Exam 3 2002 - PH 132 Exam 3 Spring 2002 Student Name_...

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PH 132 Exam 3 Spring 2002 Student Name____________________________________________________ Student Number__________________________________________________ Lab/Recitation Section Number______________________________(11,…,35) Instructions: 1. Fill out all the information above. Write your name on each page. 2. Clearly indicate your final answers for all multiple-choice questions in the space provided. 3. Present neat and orderly solutions to each problem. Clearly indicate your method of solution by including equations used for each part. Final answers should be circled or boxed . 4. Only answers written in ink (rather than pencil) will be considered for regrading if necessary. 5. Be sure to include appropriate units with all answers. 6. Permittivity of free space: ε o 885 10 12 . C N m 2 2 . Permeability of free space: µ o A 126 6 Tm Multiple Choice________ Problem 1_____________ Problem 2_____________ Total _________________ 1
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Multiple Choice (2 pts. each) 1) A closed circular loop of wire of radius R carries a current I and is placed in a uniform magnetic field as shown. Which statement is true concerning the magnitude of the net force and magnitude of the net torque acting on the loop? (Note that the magnetic field is directed into the page and is perpendicular to the plane of the loop). A) ; 0 , 0 = τ = NET NET F B) ; 0 , 2 = τ π = NET NET RIB F C) ; IB R F NET NET 2 , 0 π = τ = D) . Answer__________ IB R RIB F NET NET 2 , 2 π = τ π = 2) Consider two separate cases in which a wire carries a current through a uniform magnetic field I K B . In the first case, a semicircular shaped wire is connected from point a to point b . In the second case, the first wire is removed and a straight wire is connected from point a to point b . Which statement is true concerning the magnitude of the net force acting on each wire?
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Exam 3 2002 - PH 132 Exam 3 Spring 2002 Student Name_...

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