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Unformatted text preview: Dr. Huerta Phy 102 Test 2 Form 1 KEY 7 March 2005 Spring Semester 2005, Sections S and T THIS IS THE KEY TO FORM ONE (1) CORRECT ANSWERS ARE MARKED BY [X] EACH MULTIPLE CHOICE QUESTION IS WORTH 5 POINTS. QUESTION #13 IS FOR PARTIAL CREDIT AND WORTH 20 POINTS. Physics 102 Test 2 Form 1 KEY 7 March 2005 Dr. Huerta Phy 102 Test 2 Form 1 KEY 7 March 2005 [1.] A transformer is needed to convert the 120 V AC of the wall plug into 6 V AC. If the primary of the transformer has 200 turns, how many turns should we have on the secondary? [A] 4,000 [B] 4,120 [C] 320 [D] 80 [X] 10 [2.] Two long parallel wires lie on the plane of the paper as shown in the figure below. They carry currents of magnitudes I 1 and I 2 in the directions shown. The magnetic field at point B halfway between the wires is [A] μ ( I 1 I 2 ) 2 πL into the paper [B] μ ( I 1 I 2 ) 2 πL out of the paper [X] μ ( I 1 + I 2 ) 2 πL into the paper [D] μ ( I 1 + I 2 ) 2 πL out of the paper [E] zero I A B C L 2L L 1 2 I [3.] In the figure above, find the force that acts on a length d of the wire whose current is I 1 . [X] μ I 1 I 2 d 4 πL toward the top of the paper [B] μ I 1 I 2 d 4 πL toward the bottom of the paper [C] μ I 1 I 2 d 4 πL out of the paper [D] μ I 1 I 2 d 4 πL into the paper [E] μ I 2 4 πL into the paper [4.] A wire of resistance R is cut into three equally long pieces, which are then connected in parallel. In terms of R what is the resistance of the parallel combination?what is the resistance of the parallel combination?...
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This note was uploaded on 10/13/2011 for the course PHY 102 taught by Professor Alexandrakis during the Spring '06 term at FIU.
 Spring '06
 Alexandrakis
 Physics

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