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Unformatted text preview: Ham . CM) Z l (g“”“> Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Figure 22.2 ____, o=+2.0pc 1.6m
1.2m ' Q=1.0 [16
0 Two point charges, Q1 = 1.0 MC and Q2 = +2.0 MC, are placed as shown.
1) In Figure 22.2, the number of excess electrons in charge Q1 is closest to: A) 6 x 1012 B) 2 x 1013 C) 2 x 1011 D) 2 x 1012 E) 6 x 1011
2) In Figure 22.2, the x—component’ of the electric field, at the origin 0, is closest to:
.A) ~2700 N/ C B) —3600 N/ C C) —9000 N / C D) +3600 N/ C E) +2700 N / C
3) In Figure 22.2, the y—component of the electric ﬁeld, at the origin 0, is closest to:
A) zero B) —3600 N / C C) ~2700 N/ C D) +2700 N/ C E) +3600 N / C
Figure 22.13 4) In Figure 22.13, the electric ﬁeld lines arising from two charges Q1 and Q2 are ShOWn. From this drawing
.we can see that
A) the electric ﬁeld could be zero at P2. B) both Q1 and Q2 have the same sign.
0 Q1l > lel D) the electric field could be zero at P1.
E) None of these is true. 5) A ﬂat disk 1.0 m in diameter is oriented so as to make an angle n/ 6 radians with a uniform electric ﬁeld. If
the field strength is 266.0 N/ C, find the electric ﬂux through the surface. A) 130 NmZ/c B) 5811: N.m2/c c) 920/7: NmZ/c D) 230 NmZ/c 6) Four dipoles, each consisting of two charges 15.0 MC, are located in the xyplane 1.0 mm from the origin,
as shown. What is the ﬂux through the sphere? A) 2.3 x 106 NmZ/c B) 0 NmZ/c C) 5.6 x 105 Nm2/ C D) 4.5 x 106 Nm2/C 7) A hollow spherical conductor of inner radius 2.0 cm has a 4.0—C point charge at its center. Find the surface
charge density at the inner surface of the sphere. A) 800 c/m2 B) 800 C/m2 C) —1.0 C/m2 D) 1.0 C/m2 A—2 @vm% Z ( gown) IIULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Two identical spheres carry equal—magnitude, 1.0—nC charges that differ in sign. If their radii are 3.0 mm,
and they are 5 m apart, what is the potential difference between them?
A) 6‘ kV B) 3 kV C) 2 kV D) 0.0 V Solve the problem. (The value of k is 9.0 x 109 Nam2 / C2.) 2) A dipole with 13.0—MC charges is positioned so that the positive charge is 1.0 mm to the right of the origin
and the negative charge is at the origin. How much work does it take to bring a 6.0—MC charge from
infinity to a position x = 3.0 m, y = 0.0 mm?  A) 23] B) 59 J C) 140) D) 27} 3) Two parallel plates that are initially uncharged are separated by 1.7 mm. What charge must be transferred
from one plate to the other if 14.0 k] of energy are to be stored in the plates? The area of each plate is 7.0 m2.
' A) 32 uC B) 7.8 mC C) 46 uC . D) 23 11C 4) A 7.0—pF capacitor consists of two parallel plates that have surface charge densities of $3.0 nC/ mmz. If the
potential between the plates is 29.0 kV, find the surface area of one of the plates. A) 68 mm2 B) 0.015 mm2 C) 0.007,4 mm2 D) 34 mm2 5) Two capacitors, one a 5.0—uF capacitor, C1, and the other a 6.0“.F capacitor, C 2, are connected in series. If a 150.0—V voltage source is applied to the capacitors, as shown, find the voltage drop across the 5.0—uF
capacitor. . C1 l 150.0 V C2 A) 130 V B) 68 V . C) 82 V D) 9.0 V
6) A 2.0—uC negative charge is attracted to a large, well—anchored, positive charge. How much kinetic energy does the negatively charged object gain if the potential difference through which it moves is 5 mV?
A) 2.50 k] B) 2.50 I C) 10 n) D) 2.0 pt] A—1 3 _
0w. Wm). MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. imE___________________..— 1) A wire has a cross—sectional area of 0.10 mrnz. If there are 5.0 x 1028 atoms per cubic meter and each
contributes, on the average, 2 free electrons, what is the drift speed of the electrons when the current in the wire is 4.0 A?
A) .0025 m/s B) 0.75 m/s C) .005 m/s D) 0.010 m/s 2) How much current will be ﬂowing through a 51.0—m length of copper wire with radius 5.1 m if it is connected to a source supplying 38.0 V? (The resistivity of copper is 1.68 x 10‘8 Q  m.)
A) 22 x 108 A B) 2200 A C) 3600 A D) 130 nA 3) When a voltage difference is applied to a piece of copper wire, a 3.0—mA current ﬂows. If the copper wire is
replaced with a silver wire with twice the diameter of the copper wire, how much current will ﬂow
through the silver wire? The lengths of both wires are the same, and the voltage difference remains unchanged. (The resistivity of copper is 1.68 x 10‘8 Q  m, and the resistivity of silver is 1.59 x 10 '8 Q  m.)
A) 6.3 rnA B) 11 mA C) 3.2 mA D) 13 mA 4) A component with a 14—9 resistor is rated for use at power levels not exceeding 11 W. How much current can safely ﬂow through the component?
A) 0.24 A B) 0.89 A C) 154 A D) 1.27 A 5) A 4.0—V battery storing 56.0 k] of energy supplies 1.5 A of current to a circuit. How much energy does the
battery have left after powering the Circuit for 1.0 h.? A) 34 k] B) 22 k] C) 54 k] D) 56 k}
6) Each of the resistors in the circuit shown have a resistance of 180.0 9. What is the equivalent resistance of
the circuit?
A) 130.0 52 B) 5400 Q ‘v " C) 450.0 9 D) 720.0 £2 neg—W 6Q”)? kllf (PM...)
NOTE: 1 GAUSS = 10A(—4) T MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A wire 2.0—m long carrying a 4.0A current is oriented perpendicular to a magnetic ﬁeld of magnitude
21 T. What is the magnitude of the force on the wire? A) 10.5 N B) 269 N C) 42 N D) 168 N
2) A very long wire generates a magnetic ﬁeld of 0.009 G at a distance of 1.0 mm. What is the magnitude of
the current?
A) 18,000 mA B) 4.5 mA C) 14,000 mA D) 9.0 mA 3) A conductor is arranged in the shape of a rectangle with sides 1.0 m in length and 1.0 cm in width. If a
4.0A current flows through the conductor, what repulsive force acts on the centermost 1.0—cm segment of
the 1.0mlong side of the conductor? A) 2.5 x 107 N B) 1.6 x 106 N ' C) 3.2 x 108 N D) 3.2 x 106 N 4) A solenoid 3.0—cm long consists of 6076 loops of wire. If the magnetic ﬁeld inside the solenoid is 2.0 T,
what is the magnitude of the current that ﬂows through it?
A) 3.0 A B) 0.13 A C) 8 A D) 99 A 5) Which of the following is an accurate statement? A) The magnetic force on a moving charge does not change its energy. B) Magneticﬁeld lines have as their sources north and south poles. C) A current carrying loop of wire tends to line up With its plane parallel to an external magnetic ﬁeld in
which it is positioned. D) A magnetic field line is, by definition, tangent to the direction of the magnetic force on a moving
charge at a given point in space. E) The magnetic force on a current carrying Wire is greatest when the wire is parallel to the magnetic ﬁeld.
Figure 28.2
x x y
x x z
 x
B = 0.80 T
o——+
x ‘6 X
X X X A uniform magnetic ﬁeld of magnitude 0.80 T in the negative z—direction is present in a region of space. A uniform
electric ﬁeld is also present.
6) In Figure 28.2, the electric field is set at 12,000 V/ m in the positive y—direction. An electron is projected with an initial velocity vO : 1_ 5 x 104 m/ s in the positive x—direction. The y—component of the initial force on the electron is closest to: A) —2 x 1015 N B) +4 x 1015 N c) +2 x 10—15 N D) zero E) —4 x 1015 N A—l ...
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 Winter '07
 Onuchic

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