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Unformatted text preview: PHYS 122 Exam II November 5, 2009 '
' Prof. S.M. Bhagat M@%Sb&MTMN (Sign in ink, print in pencil) Notes:
1) There are six (6) problems in this exam. Please make sure that your copy has all of them.
2). 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. 3) Write you answers on the sheet provided. 4) Do not forget to write the units.
5) Do.not hesitate to ask for clariﬁcation at any time during the exam. You may buy a formula at the cost of one point. Take care! 'God Bless You! N v m2 _ T — m
a=%w y,m=wwtjw
so = 9x10"12 5 m
Mass of proton m p = 1.6)c10727 kg
Mass of electron me = 9x10“3 kg Elementary Charge e = 1.6x10"l9 C \. ~ A LA Vﬁ'pi Problem 1 In 2slit interference using light of wavelength xi , the ﬁrst minimum occurs When sin 61 = where d is the split separation. In single—slit diffraction the ﬁrst minimum is at . xi
8111 0, = —
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' 2 Problem 2 Plane and spherical mirrors form images given by the equations 1 1 2
_+_=_,m=_£ P q r q
where p =object distance, q =image distance, r=radius of the mirror, m =magniﬁcation. How do you
distinguish among a plane, a concave and a convex mirror? Support your answers with diagrams. (16) e "‘7 “ (mt WW“) .
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Calculate q. (neglect friction and each spring is squeezed by 0,05 m) The picture ShOWS two equal charges (q) attached to two identical springs (16)
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3 “WWW” (6) Problem 5b The picture shows several stationary charges enclosed in a closed surface.
i) What is the total ﬂux of the E — ﬁeld through the surface? Why? ii) What is the E — ﬁeld on the surface? Why? (10) Problem 6a A parallel plate capacitor with plate area A = ~2m2 is ﬁlled with air and the
plate separation is 1 cm . Put charges i lOyC on the plates. What is the potential difference betWeen the plates? Why? (8)
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plates. What is the potential difference between the plates? Why? (8) Q2
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of werk, Where does the energy go? Why? (4) Problem 60 In order to place a charge Q on a capacitor C0 you need to do , joules 2 A1 we Saw “"1 Am ﬂaw“ MW ‘6)
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