TIME OF COMPLETION NAME SOLUTION DEPARTMENT OF NATURAL SCIENCES. PHYS 1112, Exam 3 Section 1 Version 1 November 22, 2013 Total Weight: 100 points

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1 TIME OF COMPLETION NAME SOLUTION DEPARTMENT OF NATURAL SCIENCES PHYS, Exa 3 Secti Versi Nveber, 03 Ttal Weight: 00 pits. Check yur exaiati fr cpleteess prir t startig. There are a ttal f ie (9) prbles seve (7) pages.. Authrized refereces iclude yur calculatr with calculatr hadbk, ad the Referece Data Paphlet (prvided by yur istructr). 3. Yu will have 50 iutes t cplete the exaiati. 4. The ttal weight f the exaiati is 00 pits. 5. There are six (6) ultiple chice ad three (3) calculati prbles. Wrk five ultiple chice prbles ad all calculati prbles. Shw all wrk; partial credit will be give fr crrect wrk shw. 6. If yu have ay questis durig the exaiati, see yur istructr wh will be lcated i the classr. 7. Start: 9:00 a.. Stp: 9:50 a. PROBLEM POINTS CREDIT TOTAL 00 PERCENTAGE

2 CIRCLE THE SINGLE BEST ANSWER FOR ALL MULTIPLE CHOICE QUESTIONS UNLESS INSTRUCTED OTHERWISE. IN MULTIPLE CHOICE QUESTIONS WHICH REQUIRE A CALCULATION SHOW WORK FOR PARTIAL CREDIT.. A ray f light passes fr air it a blck f clear plastic. Hw des the agle f icidece i the air cpare t the agle f refracti i the plastic? a. The tw agles cat be cpared withut additial ifrati. b. The agle f icidece is less tha the agle f refracti. c. The agle f icidece is equal t the agle f refracti. d. The agle f icidece is greater tha the agle f refracti.. The ELI the ICE a eic helps yu reeber that a. Curret i a iductr lags behid vltage. b. Vltage i a iductr lags behid curret. c. Curret i a resistr lags behid vltage. d. Vltage i a resistr lags behid curret. 3. Which f the fllwig stateets are true regardig electric geeratrs? Check all that apply. a. A electric geeratr creates a tie-depedet iduced vltage. b. A electric geeratr is used t icrease r decrease a alteratig curret vltage. c. A electric geeratr creates a tie-idepedet iduced vltage. d. A electric geeratr cverts electrical eergy it agetic eergy. e. A electric geeratr cverts echaical eergy it electrical eergy.

3 4. I the figure, a cductig rd is shw vig i a uifr agetic field. Which f the fllwig stateets are true? Check all that apply. a. The agitude f the ptetial differece i the rd is prprtial t the stregth f the agetic field. b. A electric field is established i the rd directed fr pit a t pit b. c. The free charges i the rd are acted up by a agetic frce. d. The agitude f the ptetial differece i the rd is prprtial t the velcity v f the rd. e. The agitude f the ptetial differece i the rd is iversely prprtial t the legth L f the rd. 5. A resistr, a iductr, ad a capacitr are cected i series t a AC surce. What is the cditi fr resace t ccur? a. The capacitive reactace ust be equal t the iductive reactace. b. The resistace ust be equal t bth the iductive reactace ad the capacitive reactace. c. The resistace ust be greater tha the iductive reactace. d. The iductive reactace ust be greater tha the capacitive reactace. e. The capacitive reactace ust be greater tha the iductive reactace. f. The resistace ust be greater tha the capacitive reactace. PHYS Exa 3, Versi Fall 03 3

4 6. A capacitr is cected acrss a AC surce. Which f the fllwig graphs shws the istataeus curret i the circuit ad the istataeus vltage acrss the capacitr? This is the capacitr: PHYS Exa 3, Versi Fall 03 4

5 7. A series RLC circuit ctais the fllwig cpets: R = 60.0 Ω, L = H, C = 6.0 µf, ad a surce with ΔV MAX = 65.0 V peratig at 050 Hz. a. Fid the ipedace i the circuit. X L fl ( )(050 Hz)(0.390 H) 573 X C fc ( )(050 Hz)( F) Z R ( X L X C ) 564 V b. Calculate the axiu curret i the circuit. I Z I V / Z A c. Deterie the axiu vltage acrss the resistr. V I R. 5 V d. Deterie the axiu vltage acrss the capacitr. V I X C V e. Deterie the axiu vltage acrss the iductr. V I X L 65. V f. Why ca the axiu vltages add up t re tha 65.0 V? Vltages acrss all three eleets chages ut f phase with each ther which allws the t add t re tha 65.0 V. PHYS Exa 3, Versi Fall 03 5

6 8. A thi layer f ice =.309 flats the surface f water =.333 i a bucket. A ray f light fr the btt f the bucket travels upward thrugh the water a. What is the largest agle with respect t the ral that the ray ca ake at the ice-water iterface ad still pass ut it the air abve the ice?.309si si(90.0 ) 3.333si.309si( ) b. What is this agle after the ice elts? si si.333si.000si( ) 9. The cductig rd ab shw i the figure akes ctact with etal rails ca ad db. The apparatus is i a uifr agetic field T, perpedicular t the plae f the figure. PHYS Exa 3, Versi Fall 03 6

7 a. Fid the agitude f the ef iduced i the rd whe it is vig tward the right with a speed 7.50 /s. Bvl ( T)(7.50 / s)(0.50 ) V b. I what directi des the curret flw i the rd? Cuterclckwise c. If the resistace f the circuit abdc is.50 Ω (assued t be cstat), fid the agitude f the frce required t keep the rd vig t the right with a cstat speed f 7.50 /s. Yu ca igre fricti. I. 00 R A Fap FB IBl si (.00 A)(0.800 T)(0.500 )si(90.0 ) N d. Fid the directi f the frce required t keep the rd vig t the right with a cstat speed f 7.50 /s. T the right. PHYS Exa 3, Versi Fall 03 7