practice_mt1 - ‘ LI Name l f l Ta Physics 112 Winter EGGS...

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Unformatted text preview: ‘ LI Name l; f l Ta Physics 112, Winter EGGS Dr. Harper, 12:3fl Midterm #1: lf24fil5 You have 43 minutes to complete this exam. It has 2 pages of multiple choice questions, 1 page with a show—work problem, and a page of useful information at the back. which may be detached from the rest of the exam, if you like. Make sure you put your name and Tat’s name at the top of each page. SECTION 1: Multiple Choice {Total points; 33} Completely circle your answer so that your choice is clear! i 1. [6 points] In the diagram below, both point charges are positive. in which {if any) regionts) could there he a point where the electric field is equal to zero? I I H I I A. I . [II D. 1 and II] E. It depends on the magnitudes of the charges and their separation. 2. {5 points) An ion, starting from rest in a constant electric field, accelerates from A to E. Which of the following does its speed at E NOT depend on? A. the mass of the ion B. the I . - 'tude of the ion’s charge D. the distance from A to B E. the magnitude of the electric field 3. {5 points} What effect, if any, does adding a dielectric material to a capacitor have? A. It increases the capacitance B. It decreases the capacitance C. It has no effect. x L: Name k E: l_' TA 41-. [t5 points} What is the electric field in the regicn tn the left of all the plates in the diagram heiew‘? «II—dm—I- «ll—d A. {IFEU to left a. aketratet to left C. (NED ta right D. 51:01am: te right I: E. zen) ]: The next two problems refer to the following diagram at" an equilateral triangle with sides of length r: 5. (5 paints) In the diagram ahcve, if there is an electric force an the negative charge at the top of the triangle. what is its directiani'r A. tc the right E. to the left C. up D. dawn E. there is no force. 15. {6 paints} If you take awayr the tap charge in the above picture. what would the electric field at that paint he? . RD 3. Ewart \ UgSTi ON (3. mafia: (“W or; Mu; Q13 51mm”, El. .5 radial) E. .aaarkqtrrt) be 33nd real > Narne nglv TA SECTION 2 [Total points: 42 ]I - SHOW ALL OF YOUR WORK IN COMPLETING THIS PROBLEM. IF YOU NEED ELDDITIONAL SPACE, PLEASE WORK ON THE BACK OF THIS SHEET AND CLEARLY INDICATE WHICH PART OF THE PROBLEM IT IS FOR. Two very large parallel metal plates with air between them are separated by 6 mm and have a potential difference between them of 3 Volts. An electron is released from the left end of the negatively charged plate at precisely the same time a proton is released from the right end of the positive plate. In answering the questions below, you may ignore any electric interactions between the two particles. a} {5 points} If the top plate is negatively charged, will the particles pass each other midway between the plates, above the midpoint, or below the midpoint? BErOLu Mr} E d PC: [r11Z b} {5 points] Find the electric field between the plates. If you don‘t get a value for this, use T for the electric field magnitude in any of the following calculations that need it. maelt’tififl-L' —-- c} (5 points) Find the electric force on the electron due to the charged platezs. If you don‘t get a value, use F in what follows. Page; =Od2trc'WCXYOOEE.) 3 d] to points) Find the magnitude of the surface charge density on each plate. If you don’t get a value, use s in what follows. 2 _ E = “E —: on = 6.35 avatam'fri-LXS‘OG it)“ 443%??? Fri-s C) e} (E. points} If the area of one plate were $.55 m2, what would the capacitance of the plates be? If you don‘t get a value, use c in what follows. _. O2 Q: Eat—“t : -_— ‘3'.e(a)t/e""F (in 1t :04 "H 1") to points) How fast will the proton be going when it hit the negative plate? If you don't get a value, use v in what follows. ei=Ep “3 fimvlz ECVJ‘WJ i [vs-Vi ott.esra"ic 3v) ._ at v = gal-firi‘ 1: -r QHY/fl fit/5 g} {9 points} How long will it take the proton to move from the positive to e negative plate‘ir Ala: unfl-E-l-gliflfl a: F=rmar (fig V? ...
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