# Toggerson-Units3-4-Additional Units 3 and 4 problems randomized (2).pdf

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Toggerson P132 - University of Massachusetts, AmherstExam II: all Unit III - Physical Optics AND Unit IV - Electrostatics ProblemsRandomized so you can practice choosing the principle1)When the electric field is zero at a point, the potential must also be zero there.A)TrueB)False
2)As shown in the figure, three charges are at corners of a rectangle. The charge in the bottom right corner isQ= -90 nC, and all the other quantities are accurate to two significant figures. What is the magnitude of the netelectrical force onQdue to the other two charges?(k=1/4ΔΉ0=9.0×109N·m2/C2)2N
3)A point chargeQ= -500 nC and two unknown point charges,q1andq2, are placed as shown inthe figure. The electric field at the originO, due to chargesQ,q1andq2, is equal to zero. Thechargeq1is closest to
1
4)The figure shows three electric charges labeledQ1,Q2,Q3, and some electric field lines in theregion surrounding the charges. What are the signs of the three charges?
5)Electrons with a speed of 2.1×106m/s are directed towards a 1.0-μm wide slit. An electron detector is placed1.0 m behind the slit. How wide is the central maximum of the electron diffraction pattern (from the first darkon one side to the first dark on the other side) at the detector? (h=6.626×10-34J·s,melectron=9.11×10kg)-31A)690 μmB)1000 μmC)350 μmD)1400 μm
2
6)Four tiny charged particles (two having a charge+Qand two having a charge-Q) are distributed on thex-y-axes as shown in the figure. Each charge is equidistant from the origin. In which direction is the net electricfield at the point P on they-axis?and
7)In a two-slit experiment, monochromatic coherent light of wavelength 600 nm passes through a pair of slitsseparated by 2.20×10-5m. At what angle away from the centerline does the second dark fringe occur?
8)Two protons are released from rest, with only the electrostatic force acting. Which of the following statementsmust be true about them as they move apart? (There could be more than one correct choice.)
9)A proton and an electron are released from rest, with only the electrostatic force acting. Which of the followingstatements must be true about them as they move toward each other? (There could be more than one correctchoice.)A)Their electric potential energy keeps decreasing.

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Term
Winter
Professor
N/A
Tags
Wavelength, Electric charge, Fundamental physics concepts, NM