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Material Type: Exam; Professor: Mryasov; Class: Generl Physics W/Calc II; Subject: PH-Physics; University: University of Alabama; Term: Fall 2009;
Typology: Exams
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Name: ________________________ Class: ___________________ Date: __________ ID: A
Multiple Choice Identify the choice that best completes the statement or answers the question.
____ 1. Determine the current in the 10-V emf.
a. 2.3 A b. 2.7 A c. 1.3 A d. 0.30 A e. 2.5 A
____ 2. What is the potential difference V b − V a shown in the circuit below.
a. −8.0 V b. +8.0 V c. −18 V d. +18 V e. −12 V
Name: ________________________ ID: A
____ 3. Determine the magnitude and sense (direction) of the current in the 500-Ω resistor when I = 30 mA.
a. 56 mA left to right b. 56 mA right to left c. 48 mA left to right d. 48 mA right to left e. 26 mA left to right
difference V a − V b?
a. −30 V b. 30 V c. 5.0 V d. −5.0 V e. −1.0 V
Name: ________________________ ID: A
charged. Which light bulb(s) is(are) dimmest?
a. A b. B c. C d. A and B e. All three are equally bright (or dim).
____ 8. Which two circuits are exactly equivalent?
a. A and B b. B and C c. C and D d. D and E e. B and E
Name: ________________________ ID: A
____ 9. A 2.0-C charge moves with a velocity of (2.0 i + 4.0 j + 6.0 k ) m/s and experiences a magnetic force of (4.0 i − 20 j + 12 k ) N. The x component of the magnetic field is equal to zero. Determine the y component of the magnetic field. a. −3.0 T b. +3.0 T c. +5.0 T d. −5.0 T e. +6.0 T
km/s in the positive x direction at a point where Bx = 5.0 T, B (^) y = −4.0 T, and B (^) z = 3.0 T? a. 2.8 N b. 1.6 N c. 1.2 N d. 2.0 N e. 0.4 N
____ 11. The figure shows the orientation of a rectangular loop consisting of 80 closely wrapped turns each carrying a
m, b = 0.30 m, and I = 8.0 A, what is the magnitude of the torque exerted on the loop?
a. 2.5 N ⋅ m b. 1.5 N ⋅ m c. 3.1 N ⋅ m d. 2.7 N ⋅ m e. 0.34 N ⋅ m
Name: ________________________ ID: A
____ 15. The segment of wire (total length = 6 R ) is formed into the shape shown and carries a current I. What is the magnitude of the resulting magnetic field at the point P?
a.
b.
c.
d.
e.
____ 16. Two long parallel wires are separated by 2.0 cm. The current in one of the wires is three times the other
greater of the two currents? a. 2.0 A b. 1.0 A c. 3.0 A d. 9.0 A e. 1.5 A
____ 17. A hollow cylindrical (inner radius = 2.0 mm, outer radius = 4.0 mm) conductor carries a current of 24 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 5.0 mm from the axis of the conductor. a. 0.96 mT b. 1.7 mT c. 0.55 mT d. 1.2 mT e. 0.40 mT
____ 18. A conducting rod with a square cross section (3.0 cm × 3.0 cm) carries a current of 60 A that is uniformly
(1.5 cm × 1.5 cm) if the path is centered on the center of the rod and lies in a plane perpendicular to the axis of the rod?
Name: ________________________ ID: A
____ 19. A solenoid consists of 100 circular turns of copper wire. Parts of three turns, A, B and C, are shown below.
When a current flows through the coil, a. both A and C are repelled by B. b. A is attracted to B; C is repelled by B. c. neither A nor C is attracted to or repelled by B. d. A is repelled by B; C is attracted to B. e. both A and C are attracted to B.
____ 20. Two parallel and coaxial current loops of radius a are placed a distance L apart. The current in each ring circulates in the same direction. At a point on the axis half way between the loops the magnetic field in T has magnitude a. 0.
b.
4( a^2 + L^2 ) 3 / 2^
c.
2( a^2 + L^2 ) 3 / 2^
d.
( a^2 + L^2 ) 3 / 2^
e.
____ 21. An ideal solenoid of radius a has n turns per unit length and current I. The magnetic flux Φ B through any circular area of radius a inside the solenoid, centered on and perpendicular to the solenoid axis is
2 4
nI.
2 2
nI.
e. 0.
