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EME D41 1.C P
FORM 0 1.C OM Physics 102 [C] 9.07T x 109 N
D41 [B] 9.0 x 109 N &&%* x 109 N  PR
EME [A] 4.0 x 109 N
[E] 367T x 109 N 1.C OM  PR
EME D41 [l] A p erfectly conducting hollow sphere of radius 1.0 meter is centered at the origin and has
a surface charge density of 1.0 C /m 2 . What is the magnitude of the force that a 1.0 C test
charge will feel if it is located at a position x — 1.0 m, y — 1.0 m, z = 0.0 m (thus on the
xy plane)?
^ 1.C OM [2] For the conducting sphere in the above problem, what is the magnitude of the electric field
at the origin and on the surface?  PR
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EME D41 [A] 0 N /C, 0 N /C
[B] 0 N /C, 2.07rfc N /C
N/C, 4.07rjfc N /C
2.071A; N /C, 2 .07rfc N /C
[E] 4.07T& N /C, 4.071fc N/C COM [3] If a negative point charge of —4.07T Coulombs is placed at the center of the hollow,
conducting sphere described above, what is the electric flux t hrough a sphere with a radius
.O meters, centered at the origin?
O.ONm 2 /C
[ B] 2.07rJfe N m 2 /C
[ C] 2.07rfc N m 2 /C
[ D]  4.07rfc N m 2 /C
2
4.07rfc N m /C
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EM ED4 11. COM [4] A charge \q is fixed at the origin. A charge — q has a mass m and s tarts at rest at an
initial distance r^ from the origin. What is the speed of the —q charge when its distance
from the origin becomes r ^? ( Assume TB <
[A] 0
[B]
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EM ED4 [5] Circuit A contains two capacitors in series. Circuit B contains 2 capacitors in parallel. All
capacitors in b oth circuits have capacitance C. In which circuit would a dielectric material
need to be added in order to make the equivalent capacitances of circuits A and B be the
same, and w hat would the dielectric constant of the material need to be?
[A] circuit A, 2
([Sh circuit A, 4
[C] circuit B, 1/2
[D] circuit B, 2
[E] circuit B, 4 11. COM  PR
EM ED4 11. COM [6] A parallelplate capacitor is connected to a b attery and maintained at a constant potential
V. It is initially filled by vacuum and it has plates with area A separated by a distance d.
If A is increased by 2, d is decreased by 2 and a dielectric with K — 2 is inserted between
the plates, how much does the stored energy change?
A] 0
[B] decreases by 2
[C] increases by 2
[D] decreases by 8
flE)increases by 8 PRE MED 411 .CO MPRE
M ED4 11. COM  PR
EM ED4 [7] The resistivity of the material of a wire is 1.76 X 10~8 fim. If the radius of the wire is
2.0 mm and its length is 2.0 m, what is its resistance?
(JAJ/0.0028 0
[B] 0.011 ft [C] 0.51 0
[D] 2.5 ft [E] 37 0 OM  PR
EME D41 1.C P
FORM 0 1.C OM Physics 102 OM  PR
EME D41 1.C OM  PR
EME D41 [8] An RC circuit is connected across a DC voltage source through an open switch. The switch
is closed at i = 0 s. Which of the following is a correct statement regarding this circuit?
[A] The capacitor charges to its maximum value in two time constants.
[B] The resistor and the capacitor share the applied voltage equally as a f unction of time.
[C] The current flows t hrough the circuit even after the capacitor is fully charged.
[D] The time constant does not depend on the resistance or the capacitance.
(jEJjOnce the capacitor is fully charged, there is no current in the circuit.  PR
EME D41 1.C [9] A square coil, 5.0 cm on a side, has 250 t urns. When the coil is placed in a magnetic field
of 0.40 T, its maximum t orque is measured to be 0.25 N m. The current in the coil is
[A] 0.010 A
[B] 0.125 A
(fC])l.O A
[D] 2.5 A
[E] impossible to determine 11. COM  PR
EME
D4 11. COM [10] Two long parallel wires carry currents of 4.00 A and 5.00 A, respectively. If the distance
between the wires is 40.0 cm, w hat is the force per unit length between the wires?
[A]7.50^N/m
(JMIO.O/tN/m
[C] 1 5.0/xN/m
[D] 20.0
[E] 30.0 11. COM  PR
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EME
D4 [13] When a charged particle enters a region of a uniform magnetic field B, directed into the
plane of motion, it follows a circular path, as indicated in the figure.
(a) Is this particle positively or negatively charged? Explain.
(b) Suppose t hat the magnetic field has a m agnitude of 0.200 T, the particle's speed is
5.07 X 105 m /s, and the radius of the p ath is 50.0 cm. Find the mass of the particle,
given that its charge has a magnitude of 1.60 x 10~19 C. Give your results in atomic mass
units, where 1 u = 1.66 X 10~27 kg.  COM  PR
EM ED4 Cb) PRE MED 411 .CO MPRE
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FORM 0 D41 1.C OM Physics 102 A) COM  PR
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EME [11] An electron is fixed at x = — 1.00 mm and a p roton is fixed at x = +1.00 mm. G ive
numerical results when possible. Make sure to provide the m agnitude and direction for
vector quantities. Provide the u nits of the answer.
(a) What is the p otential energy of this configuration?
(b) What is the electric potential at the origin (thus at x = 0 )?
(c) W hat is the magnitude and direction of the electric field at the origin?
(d) Assume t hat an additional proton is put at the origin, and find the m agnitude and direction
of the electric force on it.  PR
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1.C OM Physics 102  PR
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EME D41 1.C OM  PR
EME D41 [12] The figure shows a circuit including a b attery of emf B = 24 V and internal resistance
T  0.50 ft, and five resistors: J?a = 2.5 ft, R2 = 5.0 ft, R3 = 8.0 ft, R± = 6.0 ft,
R5 = 2.0 ft.
(a) Find the t otal resistance of the circuit, and the current flowing through the b attery.
(b) Find the currents flowing through the resistors #3 and R$.
(c) Calculate the power dissipated by the resistor R5.
(d) Suppose point B is grounded (VB = 0). Find the potential at points A and C. PRE MED 411 .CO MPRE
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EME D41 1.C P FORM 0 1.C OM Physics 102 D41 1.C OM  PR
EME D41 FORMULAE SHEET me = 9.11 x I0~3lkg,
 PR
EME e = 1.60 x 10~19C, IkWh = 3.6 x 106 J, e0 = ^  8.85 x lQ12C*/Nr D41 1.C OM = 160 X 10"19 J, k = 8.99 x W»Nm?/C2 COM  PR
EME E = —, £ = A;!, *E =
So
r2 " V0
y " Ke0A = " ' ' —> CV2 QV UB= Q2
= ^ " ' e0E* ^ = ~~' r
Aq J =r
> / e xp(i/r), sin6, g = Q exp ( f/r), r = NIABsin6, 1= r n0 = 4?r x 1(T7—— PRE MED 411 .CO MPRE
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D4 Q V= A F = EAs, 7, 11. qo (long)' 27nf (coil) ' (solenoid) ...
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 Fall '08
 Ashkenkai
 Physics, Magnetic Field, Electric charge, m agnitude, b attery

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