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Part A. Please Choose The One Alternative That Best Completes The Statements or Answers The Questions

The document contains a series of multiple-choice questions related to physics concepts, including electric forces, electric flux, potential difference, magnetic fields, induced current, and circuit behavior. Each question provides five answer options, and the reader is instructed to select only one answer per question. The questions cover various topics in electromagnetism and circuit theory.

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16 views3 pages

Part A. Please Choose The One Alternative That Best Completes The Statements or Answers The Questions

The document contains a series of multiple-choice questions related to physics concepts, including electric forces, electric flux, potential difference, magnetic fields, induced current, and circuit behavior. Each question provides five answer options, and the reader is instructed to select only one answer per question. The questions cover various topics in electromagnetism and circuit theory.

Uploaded by

q6rkbh
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Part A.

Please choose the one alternative that best completes the statements or
45
answers the questions, circle your choice using pen.
Make sure that only ONE of the alternatives is chosen for each question. Two answers to one question will
result in loss of the mark of that question.

1. If a = 3.0 mm, b = 4.0 mm, Q1 = 40 nC, Q2 = 80 nC, and q = 36 nC in the figure, what is the magnitude of
the electric force on q?

a. 3.0 N
b. 4.4 N
c. 3.8 N
d. 5.7 N
e. 0.60 N

2. Two charges of -15 pC and 40 pC are inside a cube with sides that are of 0.40-m length. Determine the net
electric flux through the surface of the cube.
a. +2.8 N  m2/C
b. 1.1 N  m2/C
c. +1.1 N  m2/C
d. 2.8 N  m2/C
e. 0.47 N  m2/C

3. What is the potential difference VB  VA when the I = 1.0 A in the circuit segment below?

a. +22 V
b. 22 V
c. 12 V
d. +38 V
e. +2.0 V

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4. A segment of wire carries a current of 25 A along the x axis from x = 1.0 m to x = 0 and then along the z axis
from z = 0 to z = 3.0m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction.
What is the magnitude of the force on this segment of wire?
a. 1.0 N
b. 5.0 N
c. 2.0 N
d. 3.6 N
e. 3.0 N

5. A toroid is made of 1000 turns of wire of radius 2.00 cm formed into a donut shape of inner radius 10.0 cm
and outer radius 14.0 cm. When a 30.0-A current is present in the toroid, the magnetic field at a distance of
12.0 cm from the center of the toroid is
a. 0.0857 T.
b. 0.109 T.
c. 0.120 T.
d. 0.600 T.
e. 0.050 T.

6. A flat coil of wire consisting of 20 turns, each with an area of 50 cm2, is positioned perpendicularly to a
uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil
has a total resistance of 0.80 , what is the magnitude of the induced current?
a. 0.70 A
b. 0.60 A
c. 0.50 A
d. 0.80 A
e. 0.25 A

4
7. A square loop (length along one side = 20 cm) rotates in a constant magnetic field which has a magnitude of
2.0 T. At an instant when the angle between the field and the normal to the plane of the loop is equal to 30
and increasing at the rate of 10/s, what is the magnitude of the induced emf in the loop?
a. 7.0 mV
b. 0.27 V
c. 4.8 mV
d. 14 mV
e. 2.2 mV

8. When a switch is closed, completing an LR series circuit, the time needed for the current to reach three-
quarters its maximum value is ____ time constants.
a. 0.500
b. 1.39
c. 0.725
d. 1.33
e. 0.693

9. Which of the following are the units of a henry and a farad respectively?
a. J  s2/C2 and C2/J
b. V  s/A and V/C
c. V/(A  s) and C/V
d. N  m/A2 and 1/J
e. None of the above

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