{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Midterm - PH 112 MIDTERM EXAM SPRING 2006 Instructor Dr...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: PH 112 MIDTERM EXAM SPRING 2006 Instructor: Dr. Andrew Pakhomov Your name: , 6&1, In this test you can make up to 31/25 pts Good [email protected] \ Problem 1. (5 points): An electron is placed in a uniform electric field of 1.5x104 N/C. Determine its acceleration. Mass of electron: 9.1x10’31 kg. _ _.'(/c»</0 c)(/ sic/09W) F: med: 6E >0»; me (?.I x/O‘g’ n33 61:2,4 x to" “/sz Problem 2. (5 points) A glass rod of length 27 cm lies along the positive x-axis with one end at the / origin (x = 0). Given that it is charged positively in such a way that its linear charge density is a function of coordinate x: Mx) = (30.0 tie/maxi, find the total charge on the rod. L‘ GEM L ,Z?~m X 6?: j>t(x)olx = ](37</o“%3)><204>< = Canto“ 3—3 )x m 3 mm 0 an} a (/o~?c/ma>(mm>3= 0.2 nc 0 .— Problem 3. (5 points) Consider a uniform spherical shell of charge +Q and radius r surrounded by a concentric spherical shell of uniform charge -Q and radius R (R>r). Determine the E-fields inside, between and beyond the shells. Assume vacuum. fQ/ttss Lauj,O ” a) . . on; E20 Problem 4. (5 points) An electric field in a region is given by a function: oni A 1'0 E: where E; and x0 are constants. Find the potential as a fimction of position, taking the zero of potential at x= O. Vg-VA‘: JE Jew? V3: (If—EXXON - EOXZ [I Problem 5. (5 points) A little flat ceramic capacitor consists of two circular plates 0.50 cm in diameter separated by a dielectric 1/3 mm thick with a relative permittivity of 4.8. Compute its capacitance. Bonus Problem (6 points) The earth carries a net charge of about -4x105 C a) If no others charges were present, what would be the potential at the earth's surface, with respect to infinity?; b) Actually, this net negative charge is balanced by a positive charge layer in the earth's ionosphere, an electrically conducting layer about 60 km above the earth. Estimate the potential difference between the earth and ionosphere. Earth radius R9 = 6.37 x106 vm a) (mafia °+ 4 59%“ V " L620 L740? —) (W9C): ’SWO L ° (01mm gum. Q9 “WW” )maloe “043% '99: = K_§2F____:’r‘ “QM“? +604. . _ .. f" -» Oh V0“ "J‘E'Otr: "KJLQG oer/r2: X'QQ (Ke't' ‘GOw-:>: =__'-——% w; (“W0 V)(€V30w) ‘93“ V Al‘f‘eem‘hve So Cufi‘bn To bow; Problem: ~( 3 W55 'V' ° 6%} Q 6~ _, ICQ - Se V= ‘WEO 0.: Clio ( Q) - ICQ (gok‘g [at V' Ee(£@*(0tm) ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern