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Unformatted text preview: PHY 220 Classical Physics ll Chapter 27—31 test Bl Summer 2011 Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. « 1) A proton has a speed of 3.0 x 106 m/s in a direction perpendicular to a uniform magnetic field, and 1) '
the proton moves in a circle of radius 020 In. What is the magnitude of the magnetic ﬁeld? A) 0.080 T B) 0.16 T C) 0.040 T D) 0.32 T E) 0.24 T
2) A current camrmg loop of wire lies flat on a table tep. When Viewed from above, the current 2) /“ moves around the loop in a counterclockwise sense. What is the direction of the magnetic ﬁeld
caused by this current, outside the loop? The magnetic ﬁeld A) points straight down. B) points straight up. C) circles the loop in a counterclockwise direction. D) circles the loop in a clockwise direction. E) points toward the east. 3) The magnetic permeability of a ferromagnetic material is 3) A) slightly less than uo. B) much less than {.40. C) the same as no. D) much greater than '40.
E) slightly more than no. 4) Fig, 2810 shows a segment of wire Of length L = 0.5 m, carrying a current I = 20 A. Calculate the
magnitude of the magnetic field produced by this wire at a point P located at a distance D = 1.0 m
from one of the ends of the wire. FIGURE 28—10 7 {:3
v «d
7. i
i
i
2
i
a
i
‘ d 'N
‘V V. m i V‘\ N
)’ an $mmuinﬂanmn— m A) 5.8 x 10—7 T
B) 8.9 x 107 T
C) 6.3 x 107 T
D) 2.1 x 107 T ~
E) 0.8 x 107 T 5) A straight wire carries a 12—A current eastward and a seccmd straight wire carries a 14—A current
westward. The wires are separated by a distance of 42 cm. The force on a 6.4 m length of one of the
Wires IS A) 8.0 x 105 N.
B) 5.1 x 10—4 N.
C) 8.0 x 10—7 N. D) 5.1 x 106 N.
E) not possible to determine with the information given. 6) Electric fields produced by changing magnetic ﬁelds
A) are conservative.
B) are nonconservative.
C) start on negative charges and end on positive charges.
D) start on positive charges and end on negative charges.
E) do not exist. 7) An ac g erator consists of a coil with turns of wire, each with an area of 0.06 mg. The coil
rotates in a uniform magnetic field B = 0.4 T at a constant frequency of 55112. What is the maximum
induced emf? A) 110 V B) 200 v C) 332 v D) 625 V E) 421 v 4)__E_ U1
\u/
'73.» 6)L m i ,
,,§ 8) If the lac peak current through a 100 ohm resistor is 1.7 A, the peak voltage across this resistor is A) 110 V. B) 210 v. C) 289 V. D) 120 V. E) 170 V. 9) The value of the electric ﬁeld for a certain type of electromagnetic wave is 570 N /C. What is the
value. of the magnetic ﬁeld for that wave? A) 1.10 x 106 T
B) 2.41 x 106 T
£31.90 x 106 T
D) 2.91 x 106 T
E) 1.41 x 106 T 10) A vertical wire carries a current straight up in a region where the magnetic field vector points due
north. What is the direction of the resulting force on this current? A) west B) north ‘ C) east D) down E) south 11) Four long parallel wires each carry 2.0 A in the same direction. They are parallel to the zaxis, and
they pass through the corners of a square of side 4.0 cm positioned in the x—y plane. What
magnetic ﬁeld does one of the wires experience due to the other wires? A) 1.2 g 105 T
B) 0T C) 2.1 x 106 T
D) 1.2 x 10—6 T
E) 2.7 x 105 T ~ Mark or; 5925:}? Pug 55*3 12) A singleturn plane loop of wire with a cross—sectional area 200 c1112 is perpendicular to a magnetic
ﬁeld that increases uniformly from 0.200 T to 2.800 T in 2.20 seconds. What is the magnitude of the induced current if the resistance of the coil is 8.00 D? A) 3.18 mA B) 2.95 mA C) 3.18 A D) 2.95 A E) 0 A 9 A A A 13) Aforce F =( 6 x 103 N )1— (4 x 103 N)j — (8 x 103 N)kis acting ona charge q=2 x 109 C
9 A A moving inside a uniform magnetic ﬁeld with a velocity V: (2 x 105 111/5) 1' + (3 x 106 iii/s . Calculate the components of the magnetic field knowing that the x— component of the ﬁeld is equal
to zero. A1713: (210411112
B) E =— (4T)§+ (0.5 TN:
C) E z (4 T)’f— (0.5 T)l:
D) B) =—(3T)f+(2T)1A<
E) 3. s—(znh (1 T112 14‘ A cordless “hone o crates at
I y
A) 3.3 m 00 MHZ. What is the associated wavelength?
In D) 300 m C) 900 m E) 0.33 m 8)L 10) iiime 11') rim W cm we,» 2"“ we ’7‘
1? st
32, I y it) 57
1W, w”: 12) B 13) SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. FIGURE 27—9 V01“ I2. :53 m if; amt; A
ﬁles, {it €771;
1—————— 10 cm —————+
. B 45°
/‘ 5 A 4———1Elcm———§ 15) A wire in the shape of an lies in the plane of the paper. It carries a current of/ZO A, 15)
ﬂowing from A to E. It is placed in a uniform magnetic ﬁeld of 0.75 T in the same plane,
directed as shown on the right side of Figure 27—9. The ﬁgure indicates the dimensions of
the wire.
(a) What is the magnitude and direction of the force acting on section AB of this wire?
(b) What is the magnitude and direction of the force acting on section BC of this wire?
(c) What is the magnitude and direction of the force acting on section CD of this wire?
((1) What is the magnitude and direction of the force acting on section DE of this wire?
(e) What is the magnitude and direction of the force acting on the wire? 16) A DC motor of internal resistance 14.0 D is connected to a 24—V power supply. The 16)
operating current is 1.0 A.
(a) What is the startup current?
(b) What is the back emf when the motor is running at full speed?
(c) What is the back emf when the motor is running at half speed? 17) An LRC circuit with R = 35 Q, L = 30 mH, and C = 40 uF, is attached to a 100 V ac (rms) 17)
power supply at the resonant frequency.
(a) What is the current (ms) in the circuit?
(b) What is the power dissipated by the circuit? 18) An electron moves with a speed of 1.0 x 106 m/s along the +x axis. It enters a region where 18)
there is a magnetic ﬁeld of 2.5 'l‘, directed at an angle of 60“ to the +x axis and lying in the
xy plane.
(a) Calculate the magnitude of the magnetic force on the electron.
(b) Calculate the magnitude of the acceleration of the electron. 19) A 100—loop coil of cross sectional area 8.5 (3112 lies in the plane of the paper. Directed out of 19)
the plane of the paper is a magnetic ﬁeld of 0.06 T. The field out of the paper decreases to
0.02 T in 12 milliseconds.
(a) What is the magnitude of the change in magnetic ﬂux enclosed by the coil?
(b) What is the average voltage induced in the coil as the ﬂux is changing?
(c) If the coil has a resistance of 4.0 ohms, What is the magnitude of the current in the coil? 20) An LRC circuit has R = 15.0 0., L = 25.0 mH, and C == 30.0 The circuit is connected to a 20)
120 V (rms) source with frequency 200 Hz.
(a) What is the impedance of the circuit?
(b) What is the rms current in the circuit?
(c) What is the rms voltage across the resistor?
(d) What is the rms voltage across the inductor?
(e) What is the rms voltage across the capacitor?
(f) If the current in the circuit is given by I: I0 sin wt, the voltage is given by TRUE/FALSE. Write 'T‘ if the statement is true and T“ if the statement is false. 21) A series LRC circuit connected across an ac voltage source has minimum current flowing through
the circuit when operating at the resonant frequency. 22) A series LRC circuit connected across an ac voltage source will have a yositive value of the Phase
angle at high frequencies. I) WE: V312 \ 8:13“ } MM
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 Summer '11
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