PHY2054 Final Exam Multiple Choice Study Guide
With Complete Solutions
Just after two identical point charges are released when they are a distance D
apart in outer space, they have an acceleration a. If you release them from a
distance D/2 instead, their acceleration will be?
A. 2a
B. a/2
C. a/4
D. 4a - ANSWER D. 4a
If the electric field is E at a distance d from the point charge, its magnitude will
be 4E at a distance?
A. d/2
B. 16d
C. 2d
D. d/4
E. 4d - ANSWER A. d/2
Which of the following statements is true?
A. two positive charges will attract each other
B. A positive charge and a negative charge will repel each other
C. Two positive charges attract each other
D. A positive charge and a negative charge attract each other
E. Electric charge is not conserved - ANSWER D. A positive charge and a
negative charge attract each other
Is it possible for the electric field between two positive charges to equal zero
along the line joining the two charges?
A. No, a zero electric field cannot exist between the two charges
B. This cannot be determined without knowing the magnitude of the two charges
C. Yes, but only is the two charges are equal in magnitude
D. This cannot be answered without knowing the separation between the two
charges
E. Yes, regardless of the two charges - ANSWER E. Yes, regardless of the two
charges
When a point charge of -q is placed on one corner of a square, an electric field
strength 2.5 N/C is observed at the center of the square. Suppose three
electrical charge of -q are placed on the remaining three corners of the square.
What is the magnitude of the net electric field at the center of the square?
A. The magnitude of the net electric field at the center of the square is 0 N/C
, B. The magnitude of the net electric field at the center of the square is 7.5 N/C
C. The magnitude of the net electric field at the center of the square is 10 N/C
D. The magnitude of the net electric field at the center of the square is 12 N/C
E. The magnitude of the net electric field at the center of the square is 1.25 N/C -
ANSWER A. The magnitude of the net electric field at the center of the square is
0 N/C
An electric field of magnitude E is measured at a distance R from a point charge
Q. If the charge is changed to 4Q and the electric field is now measured at a
distance 4R from the charge, the new measured value of the field will be:
A. E/16
B. E
C. 4E
D. 16E
E. E/4 - ANSWER E. E/4
Two charged small spheres are a distance R apart and exert an electrostatic
force F on each other. If the distance is increased to 3R, The force exerted on
each sphere will be
A. 3F
B. F/9
C. F/3
D. 9F - ANSWER B. F/9
If the potential (relative to infinity) due to a point charge is V at a distance R from
this charge, the distance at which the potential (relative to infinity) is V=V/4 is
A. 16R
B. R/16
C. R/4
D. 4R - ANSWER D. 4R
The electric potential (relative to infinity) due to a single point charge Q is 50V at
a point that is 2.2m to the left of Q. The electric potential (relative to infinity) at a
point 2.2m to the right of Q is:
A. 100
B. -25
C. -100
D. 25
E. 50
F. -50 - ANSWER E. 50
Which of the following statements is true?
A. Electric field lines near negative point charges circle clockwise
B. Electric field lines near negative point charges radiate outwards
C. Electric field lines near positive charges circle clockwise
D. Electric field lines near positive point charges radiate inward
With Complete Solutions
Just after two identical point charges are released when they are a distance D
apart in outer space, they have an acceleration a. If you release them from a
distance D/2 instead, their acceleration will be?
A. 2a
B. a/2
C. a/4
D. 4a - ANSWER D. 4a
If the electric field is E at a distance d from the point charge, its magnitude will
be 4E at a distance?
A. d/2
B. 16d
C. 2d
D. d/4
E. 4d - ANSWER A. d/2
Which of the following statements is true?
A. two positive charges will attract each other
B. A positive charge and a negative charge will repel each other
C. Two positive charges attract each other
D. A positive charge and a negative charge attract each other
E. Electric charge is not conserved - ANSWER D. A positive charge and a
negative charge attract each other
Is it possible for the electric field between two positive charges to equal zero
along the line joining the two charges?
A. No, a zero electric field cannot exist between the two charges
B. This cannot be determined without knowing the magnitude of the two charges
C. Yes, but only is the two charges are equal in magnitude
D. This cannot be answered without knowing the separation between the two
charges
E. Yes, regardless of the two charges - ANSWER E. Yes, regardless of the two
charges
When a point charge of -q is placed on one corner of a square, an electric field
strength 2.5 N/C is observed at the center of the square. Suppose three
electrical charge of -q are placed on the remaining three corners of the square.
What is the magnitude of the net electric field at the center of the square?
A. The magnitude of the net electric field at the center of the square is 0 N/C
, B. The magnitude of the net electric field at the center of the square is 7.5 N/C
C. The magnitude of the net electric field at the center of the square is 10 N/C
D. The magnitude of the net electric field at the center of the square is 12 N/C
E. The magnitude of the net electric field at the center of the square is 1.25 N/C -
ANSWER A. The magnitude of the net electric field at the center of the square is
0 N/C
An electric field of magnitude E is measured at a distance R from a point charge
Q. If the charge is changed to 4Q and the electric field is now measured at a
distance 4R from the charge, the new measured value of the field will be:
A. E/16
B. E
C. 4E
D. 16E
E. E/4 - ANSWER E. E/4
Two charged small spheres are a distance R apart and exert an electrostatic
force F on each other. If the distance is increased to 3R, The force exerted on
each sphere will be
A. 3F
B. F/9
C. F/3
D. 9F - ANSWER B. F/9
If the potential (relative to infinity) due to a point charge is V at a distance R from
this charge, the distance at which the potential (relative to infinity) is V=V/4 is
A. 16R
B. R/16
C. R/4
D. 4R - ANSWER D. 4R
The electric potential (relative to infinity) due to a single point charge Q is 50V at
a point that is 2.2m to the left of Q. The electric potential (relative to infinity) at a
point 2.2m to the right of Q is:
A. 100
B. -25
C. -100
D. 25
E. 50
F. -50 - ANSWER E. 50
Which of the following statements is true?
A. Electric field lines near negative point charges circle clockwise
B. Electric field lines near negative point charges radiate outwards
C. Electric field lines near positive charges circle clockwise
D. Electric field lines near positive point charges radiate inward
