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Test 2 with Answer Key for General Physics with Calculus II | PH 106, Exams of Physics

Material Type: Exam; Professor: Mryasov; Class: Generl Physics W/Calc II; Subject: PH-Physics; University: University of Alabama; Term: Fall 2009;

Typology: Exams

Pre 2010

Uploaded on 11/24/2009

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Name: ________________________ Class: ___________________ Date: __________ ID: A
1
test 2
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 Vb Va shown in the circuit below.
a. 8.0 V
b. +8.0 V
c. 18 V
d. +18 V
e. 12 V
pf3
pf4
pf5
pf8
pf9
pfa

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Download Test 2 with Answer Key for General Physics with Calculus II | PH 106 and more Exams Physics in PDF only on Docsity!

Name: ________________________ Class: ___________________ Date: __________ ID: A

test 2

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

____ 4. If ε 1 = 4.0 V, ε 2 = 12.0 V, R 1 = 4 Ω, R 2 = 12 Ω, C = 3 μF, Q = 18 μC, and I = 2.5 A, what is the potential

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

____ 7. The circuit below contains three light bulbs and a capacitor. The emf ε = 110V. The capacitor is fully

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

____ 10. What is the magnitude of the magnetic force on a charged particle ( Q = 5.0 μC) moving with a speed of 80

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

current I. The magnetic field in the region is (40 i ) mT. The loop can turn about the y axis. If θ = 30°, a = 0.

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.

μ 0 I

8 R

b.

μ 0 I

2 R

c.

μ 0 I

4 R

d.

μ 0 I

2 π R

e.

μ 0 π I

8 R

____ 16. Two long parallel wires are separated by 2.0 cm. The current in one of the wires is three times the other

current. If the magnitude of the force on a 2.0-m length of one of the wires is equal to 60 μN, what is the

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

distributed across the cross section. What is the magnitude of the (line) integral ÿ B ⋅ d s around a square path

(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?

a. 14 μT ⋅ m

b. 75 μT ⋅ m

c. 19 μT ⋅ m

d. 57 μT ⋅ m

e. 38 μT ⋅ m

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.

μ 0 Ia^2

4( a^2 + L^2 ) 3 / 2^

c.

μ 0 Ia^2

2( a^2 + L^2 ) 3 / 2^

d.

μ 0 Ia^2

( a^2 + L^2 ) 3 / 2^

e.

2 μ 0 I

L

____ 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

a. μ 0 π a

2 4

nI.

b. μ 0 π a

2 2

nI.

c. μ 0 π a^2 nI.

d. 2 μ 0 π a^2 nI.

e. 0.

test 2 [Answer Strip] ID: A

_____A 1.

_____A 2.

_____A 3.

_____A 4.

_____D 5.

_____B 6.

_____C 7.

_____E 8.

_____B 9.

_____ 10.D

_____ 11.D

test 2 [Answer Strip] ID: A

_____ 12.D

_____ 13.B

_____ 14.A

_____ 15.A

_____ 16.C

_____ 17.A

_____ 18.C

_____ 19.E

_____ 20.D

_____ 21.C