exam_3_tuethur

exam_3_tuethur - PHYS 122 Name: (Sign in ink, print in...

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Unformatted text preview: PHYS 122 Name: (Sign in ink, print in pencil) Notes ' SJ‘P‘E” / 0 December 1, 2011 Prof. S.M. Bhagat LN EXAM III There are six (6) problems in this exam. Please make sure that your copy has all of them. Please show your work, indicating clearly what formula you used and what the symbols mean. Just writing the answer will not get you full credit. ‘In stating vectors, give both magnitude and direction. . Write your answers on the sheets provided. Do not forget to write the units. Do not hesitate to ask for clarification at any time during the exam. You may - buy a formula at the cost of one point. ' NO CAC Take Care! God Bless You! N-m2 CZ 80 =9x10“12% ' mp =1.6><10”27kg me=9><10"31kgv e =1.6><1049C ke =9><lO9 'Mass of proton Mass of electron Elementary Charge , _ ~7H ,uo —47r><10 a ULATORS ! t1 Probla Write down Ampere’é law, defining the sum on the left side of the equation precisely. (6) @AMaQ, ,D CMWzm/t’ an E? Hat/Lee. 34% chfiwéwefij WQM.MW€ MW, (.41 CCYCoJ MAA" 41f if? Problb A cylindrical shell of radius R which is much larger than its thickness t = 1mm carries a current density 1 = Samp/ m2)”; . Show that the E fields jumps by (2 7: x 109) T as its surface is crossed. (10) g Ra. 2%)}.(0 {I ’e, "’ . . .7 ' (24'? (be We») ZMs/‘wr' BM.) =m£ AWL Prob 2a What is sound? What is light? Give precise definitions. (3,3) Suwanee; mwefiaflwawkxfl “ta-1W6 exam “swamp. cg; Mag“, ZoHa: 42/“ 2,43 (4%?” D'7M: TYMXWi£~e EM W «of, Sfi—ewgg V61 C— .3 KngW’LS WWeIQW-f'fifig LU: V4.4; V Prob 2b List 5 notable differences between light and sound, (10) Kama ' L1 230w V ‘1 5 N9 I 33W We. “TMw/E [ms :mf AM, N o be. . TAM5UMSE . k L I ' :3 LD MG” fab’fi‘m L EJ- E'C”? M MAG/U??? c: U... , 13») N66 Mw , w flwt 3QDCM)5 gfiie‘g “’1‘ 59M mix: 6 xii H , Prob 3a What is the difference between a resistor and an inductor? (3,3) A A. Mj‘nfl‘i‘w {:5- LCW (fmwbml A 69% Swead-zrf Swag (2... i ‘4 R'fiw' Ugi—QLv—LIZ'L p’ > Prob 3b Shown are two circuits ' C: -~t WW t R1,, rim In both cases, the capacitor is charged to (+Q, Q) and the switch is closed. How will the charge on C vary with time? Why? 6‘? Prob 4 Shown is a coil of area A suspended in all? — field and free to rotate about y—axis. (i) How would you use it as a generator? (ii) What is the maximum am f it will generate? (iii) Show that the maximum 8111 f occurs when the flux of 13 through the coil is zero. (5,lO,S) air-5? ‘ - m. trig ‘fic 'ézlwixC» ... t “La w > m} Maxwwu amt/,6.” “aw: mm}: We, WMW‘ [5‘4 ~57 Lamflwwe em, .93 _\ A 2:. i a Li Mwfi W "ERA/at A941; Wuhan” A'L’" Elam“ . . ’ t?" . , , 51M tie-“mm? 5;,Mwflwy Mfim £ (AA; » Prob 5b What is the difference between a displacement current and a conduction r current? ' \ (5,5) <2» i» a. ASE . . AL.” Pl «@3me Mfiwfl “M * Waist/an Wt'mgg me ‘ (:3) "2‘ MMFE Z mchgw (“W, Vaficcucfi At” a ML“ (A é 1086352 WWW CMWQWV M3 M w Me “A 632.. Q'Wwflemflw 0&ch V? M Q, a, be» :34? Prob 6a State Fermat’s principle for propagation of light. (6) FWka JPWM angelica 57PM came-z LG? we» MW 6(1) “A m") 4e «P me warm “Fm/kw pom; Xamnh ‘l‘i‘Mfi Prob 6b Use F ermat’s principle to show that the angle of reflection is equal to the angle of incidence. . i (10) m 7h. ...
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exam_3_tuethur - PHYS 122 Name: (Sign in ink, print in...

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