Unformatted text preview: OM  PR
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
EME
D4 11. COM  PR
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 11. COM  PR
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
M ED4 11. ff\  <8>B (g) OM  PR
EME D41 1.C P
FORM 0 D41 1.C OM Physics 102 A) COM  PR
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EME D41 1.C OM  PR
EME D41 1.C OM  PR
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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EME D41 1.C P
1.C OM Physics 102  PR
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EME D41 1.C OM  PR
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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EME
D4 Q V= A F = EAs, 7, 11. qo (long)' 27nf (coil) ' (solenoid) ...
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 Fall '08
 Ashkenkai
 Physics

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