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Material Type: Exam; Class: Classical and Modern Physics; Subject: Physics; University: Bucknell University; Term: Spring 2004;
Typology: Exams
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k =9.0x10^9 Nm^2 /C^2 me =9.1x10-31^ kg = 511 keV/c^2 mp =1.67x10-27^ kg = 938 MeV/c^2
e = 1.6x10-19^ C 1 eV = 1.6x10-19^ J μo = 4πx10-7^ Tm/A m earth = 5.98x10^24 kg
6 μC
, and positioned as shown. Find the total electric force on q
q 2 (^) =− 10 μC q 3 =+
3
μ C
μ C μC
y
x
(m)
(m)
q = −5 q = − 1 2
3 q = +
F E
D
A
B C
P
along the horizontal axis as illustrated. All the charges are negative, and they all have same magnitude. Which arrow best represents the electric field vector at the point P? (Circle one.)
A B C D E F
Briefly explain your reasoning:
arranged as shown. The electric potential for each plate is shown in the figure. Determine the magnitude and direction of the electric field in the region between plates 2 and 3.
V 1 =200 V V 2 = 0 V V 3 = −60 V
1.0 cm 2.4 cm
1 2 3
of the page, and a uniform magnetic field of T p out of the page. A current I = 3 A flows clockwise around the loop. Determine the torque on the loop about its center.
5 cm
5 cm
oints
r in a uniform magnetic field B = ( 4 i ˆ+ 5 ˆ j )× 10 −^2 T
r
. Calculate the ma
gnetic force on the electron.
second identical piece of tape is pressed down on the table beside the first piece of tape. The two pieces of tape are then ripped quickly from the table. The strips of tape are allowed to hang vertically, and brought next to each other. Do the strips of tape attract, repel, or hang unaffected by each other? Explain your reasoning.
x
y
d
charge density λ and length L is located on the y axis with one end at the origin as shown Set up the integral that you would evaluate to determine the y component of the electric field Ey at the point P on the y axis a distance d below the origin, as shown. You do not need to evaluate the integral. Your expression should contain only given quantities, physical constants, and your integration variable.