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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! Nm2
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, "’ . .
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(be We») ZMs/‘wr'
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AWL Prob 2a What is sound? What is light? Give precise deﬁnitions. (3,3) Suwanee; mweﬁaﬂwawkxﬂ “ta1W6
exam “swamp. cg; Mag“, ZoHa:
42/“ 2,43 (4%?” D'7M: TYMXWi£~e EM W «of, Sﬁ—ewgg
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LU: V4.4; V Prob 2b List 5 notable differences between light and sound, (10)
Kama ' L1 230w V ‘1
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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% Sweadzrf 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) air5?
‘  m. trig ‘ﬁc 'ézlwixC» ... t
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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 ‘
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é 1086352 WWW CMWQWV M3 M
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Q, a, be» :34? Prob 6a State Fermat’s principle for propagation of light. (6) FWka JPWM angelica 57PM
camez 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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 Fall '11
 Bhagat
 Physics

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