Test Bank for University Physics for Life Sciences 1st
Edition Randall-stamped
1) Two charged objects attract each other with a certain force. If the charges on both
objects are doubled with no change in separation, the force between them -
ANSWER D) quadruples
2) An electron and a proton are separated by a distance of 1m. What happens to the
size of the force on the proton if the electron is moved 0.5 cm closer to the proton? -
ANSWER D) it increases to 4 times its original value
3) Sphere A carries a net charge and sphere B is neutral. They are placed near each
other on an insulated table. Which statement best describes the electrostatic force
between them? - ANSWER D ) There is a force of attraction between them
4) A point charge of +Q is placed at the centroid of an equilateral triangle. When a
second charge of +Q is placed at one of the triangle's vertices, an electrostatic force
of 4 N acts on it - ANSWER C) 4N
5) In electricity, what quantity is analogous to the "acceleration of gravity" g (which is
a force per unit mass)? - ANSWER D) electric field
6) Which of the following makes an approximate uniform electric field? - ANSWER
A) very large, closely separated, parallel oppositely charged plates
7) The electric field shown in Fig. 15-3 - ANSWER a) increases to the right
8) Two stationary point charges are shown in Fig. 15-4 the sketch along with some
electric field lines representing the field between them. What can you deduce from
the sketch? - ANSWER D) q1 is positive and q2 is negative; the magnitude of q1
is greater than the magnitude of q2
9) Fig. 15-5 shows four Gaussian surfaces surrounding a distribution of charges.
Which Gaussian surfaces have an electric flux of +q/Eo through them? - ANSWER
B) B
10) Fig. 15-5 shows four gaussian surfaces surrounding a distribution of charges.
Which gaussian surfaces have no electric flux through them? - ANSWER E) C
11) The force of attraction between a -40.0 uC and +108 uC charge is 4.00 N. What
is the separation between the two charges? - ANSWER D) 3.12 m
12) Two point charges, initially 2.0 cm apart, experience a 1.0N force. If they are
moved to a new separation of 8.0 cm, what is the electric force between them? -
ANSWER 1/16 N
, 13) Two point charges of +30.0 uC and -9.00 uC are separated by a distance of 20.0
cm. A +7.00 uC charge is placed midway between these two charges. What is the
electric force acting on this charge because of the other two charges? - ANSWER
E) 245 N directed towards the negative charge
14) A shown in Fig. 15-7, a point charge of +Q is placed at the center of a square,
and a second point charge of -Q is placed at the upper left corner. It is observed that
an electrostatic force of 2N acts on the positive charge at the center. What is the
magnitude of the force that acts on the center charge id a third charge of -Q is
placed in the lower left corner? - ANSWER B) 2 sq rt of 2
15) Consider point charges of +Q and +4Q, which are separated by 3m. At what
point, on a line between the two charges, would it be possible to place a charge of -
Q such that the electrostatic force acting on it would be zero ? - ANSWER C) 1 m
from the +Q charge
16) Two point charges of +20.0 uC and -8.00 uC are separated by a distance of 20.0
cm. What is the intensity of the electric field (E) midway between these two charges?
- ANSWER D) 25.2 * 10 ^6 N/C towards the negative charge
17) Consider a square which is 1.0 on a side. Charges are placed at the corners of
the square as follows: +4.0 uC at (0,0); +4.0uC at (1,1); +3.0 uC at (0,1). What is the
magnitude of the electric field at the square's center? - ANSWER E) 1.1 * 10^5
N/C
18) Fig. 15-8 shows the electric field lines near two electric point charges. If Q1 = -1
uC, what is the value of Q2? - ANSWER A) + 2 uC
19) Two point charges of +6.00 uC and +9.00 uC are placed inside of cube of edge
length 0.100 m. The net electric flux due to there charges is given by? - ANSWER
A) 1.69 * 10^6 N/C
20) A negative charge, if free, tries to move - ANSWER A) from low potential to
high potential
21) The absolute potential at the center of a square is 3 V when a charge of +Q is
located at one of the square's corners. What is the absolute potential at the square's
center when a second charge of -Q is placed at one of the remaining corners? -
ANSWER D) zero
22) An equipotential surface must be - ANSWER B) perpendicular to the electric
field at any point
23) For a proton moving in the direction of the electric field - ANSWER c) its
potential energy decreases and its electric potential decreases
24) For an electron moving in a direction opposite to the electric field - ANSWER
D) its potential energy decreases and its electric potential increases
25) Capacitence of capacitors depends upon - ANSWER D) all of these answers
Edition Randall-stamped
1) Two charged objects attract each other with a certain force. If the charges on both
objects are doubled with no change in separation, the force between them -
ANSWER D) quadruples
2) An electron and a proton are separated by a distance of 1m. What happens to the
size of the force on the proton if the electron is moved 0.5 cm closer to the proton? -
ANSWER D) it increases to 4 times its original value
3) Sphere A carries a net charge and sphere B is neutral. They are placed near each
other on an insulated table. Which statement best describes the electrostatic force
between them? - ANSWER D ) There is a force of attraction between them
4) A point charge of +Q is placed at the centroid of an equilateral triangle. When a
second charge of +Q is placed at one of the triangle's vertices, an electrostatic force
of 4 N acts on it - ANSWER C) 4N
5) In electricity, what quantity is analogous to the "acceleration of gravity" g (which is
a force per unit mass)? - ANSWER D) electric field
6) Which of the following makes an approximate uniform electric field? - ANSWER
A) very large, closely separated, parallel oppositely charged plates
7) The electric field shown in Fig. 15-3 - ANSWER a) increases to the right
8) Two stationary point charges are shown in Fig. 15-4 the sketch along with some
electric field lines representing the field between them. What can you deduce from
the sketch? - ANSWER D) q1 is positive and q2 is negative; the magnitude of q1
is greater than the magnitude of q2
9) Fig. 15-5 shows four Gaussian surfaces surrounding a distribution of charges.
Which Gaussian surfaces have an electric flux of +q/Eo through them? - ANSWER
B) B
10) Fig. 15-5 shows four gaussian surfaces surrounding a distribution of charges.
Which gaussian surfaces have no electric flux through them? - ANSWER E) C
11) The force of attraction between a -40.0 uC and +108 uC charge is 4.00 N. What
is the separation between the two charges? - ANSWER D) 3.12 m
12) Two point charges, initially 2.0 cm apart, experience a 1.0N force. If they are
moved to a new separation of 8.0 cm, what is the electric force between them? -
ANSWER 1/16 N
, 13) Two point charges of +30.0 uC and -9.00 uC are separated by a distance of 20.0
cm. A +7.00 uC charge is placed midway between these two charges. What is the
electric force acting on this charge because of the other two charges? - ANSWER
E) 245 N directed towards the negative charge
14) A shown in Fig. 15-7, a point charge of +Q is placed at the center of a square,
and a second point charge of -Q is placed at the upper left corner. It is observed that
an electrostatic force of 2N acts on the positive charge at the center. What is the
magnitude of the force that acts on the center charge id a third charge of -Q is
placed in the lower left corner? - ANSWER B) 2 sq rt of 2
15) Consider point charges of +Q and +4Q, which are separated by 3m. At what
point, on a line between the two charges, would it be possible to place a charge of -
Q such that the electrostatic force acting on it would be zero ? - ANSWER C) 1 m
from the +Q charge
16) Two point charges of +20.0 uC and -8.00 uC are separated by a distance of 20.0
cm. What is the intensity of the electric field (E) midway between these two charges?
- ANSWER D) 25.2 * 10 ^6 N/C towards the negative charge
17) Consider a square which is 1.0 on a side. Charges are placed at the corners of
the square as follows: +4.0 uC at (0,0); +4.0uC at (1,1); +3.0 uC at (0,1). What is the
magnitude of the electric field at the square's center? - ANSWER E) 1.1 * 10^5
N/C
18) Fig. 15-8 shows the electric field lines near two electric point charges. If Q1 = -1
uC, what is the value of Q2? - ANSWER A) + 2 uC
19) Two point charges of +6.00 uC and +9.00 uC are placed inside of cube of edge
length 0.100 m. The net electric flux due to there charges is given by? - ANSWER
A) 1.69 * 10^6 N/C
20) A negative charge, if free, tries to move - ANSWER A) from low potential to
high potential
21) The absolute potential at the center of a square is 3 V when a charge of +Q is
located at one of the square's corners. What is the absolute potential at the square's
center when a second charge of -Q is placed at one of the remaining corners? -
ANSWER D) zero
22) An equipotential surface must be - ANSWER B) perpendicular to the electric
field at any point
23) For a proton moving in the direction of the electric field - ANSWER c) its
potential energy decreases and its electric potential decreases
24) For an electron moving in a direction opposite to the electric field - ANSWER
D) its potential energy decreases and its electric potential increases
25) Capacitence of capacitors depends upon - ANSWER D) all of these answers
