PHYS 2326 EXAM 1 QUESTIONS WITH VERIFIED SOLUTIONS LATEST UPDATE 2026
When you rub a plastic rod with fur, the plastic rod becomes negatively charged and the fur becomes
positively charged. As a consequence of rubbing the rod with the fur, - Answers the rod gains mass
and the fur loses mass
An alpha particle has mass m=6.64x10-27 kg and charge q=2e=3.2x10-19C. Compare the magnitude of
the electric repulsion between the two α particles with that of the gravitational attraction between
them - Answers Fe/Fg = 3.1x 10^35
Three point charges lie at the vertices of an equilateral triangle as shown. All three charges have the
same magnitude, but charges #1 and #2 are positive (+q) and charge #3 is negative (-q). The net
electric force that charges #2 and #3 exert on charge #1 is in - Answers -y direction
A point charge q=-8.0 nC is located at the origin. Find the electric field vector at the field point x=1.2
m and y=-1.6 m. - Answers (-11N/c) i + (14 N/c) j
Two point charges and a point P lie at the vertices of an equilateral triangle as shown. Both point
charges have the same magnitude q but opposite signs. There is nothing at point P. The net electric
field that charges #1 and #2 produce at point P is in - Answers +y direction
Two point charges Q1 and Q2 of equal magnitudes and opposite signs are positioned as shown in the
figure. Which of the arrows best represents the net electric field at point P due to these two charges?
- Answers A
Three equal negative point charges are placed at three of the corners of a square of side d as shown
in the figure. Which of the arrows represents the direction of the net electric field at the center of the
square? - Answers C
Three point charges lie at the vertices of an equilateral triangle as shown. Charges #2 and #3 make up
an electric dipole. The net electric torque that charge #1 exerts on the dipole is - Answers clockwise
An electron is initially moving to the right when it enters a uniform electric field directed upwards.
Which trajectory shown below will the electron follow? - Answers trajectory z
Spherical Gaussian surface #1 has point charge +q at its center. Spherical Gaussian surface #2, of the
same size, also encloses the charge but is not centered on it. There are no other charges inside either
Gaussian surface. Compared to the electric flux through surface #1, the flux through surface #2 is -
Answers the same
Two point charges, +q (in red) and -q (in blue), are arranged as shown. Through which closed
surface(s) is/are the net electric flux equal to zero? - Answers surface C and D
Four dipoles, each consisting of a +10-µC charge and a -10-µC charge, are located in the xy-plane with
their centers 1.0 mm from the origin, as shown. A sphere passes through the dipoles, as shown in the
figure. What is the electric flux through the sphere due to these dipoles? - Answers 4.5 x 10^6
Nm^2/C
A cone is resting on a tabletop as shown in the figure with its face horizontal. A uniform electric field
of magnitude 4550 N/C points vertically upward. How much electric flux passes through the sloping
side surface area of the cone? - Answers 6.36 Nm^2/c
There is a negative surface charge density in a certain region on the surface of a solid conductor. Just
beneath the surface of this region, the electric field - Answers 0
Two point charges, +q (in red) and -q (in blue), are arranged as shown. Through which closed
surface(s) is/are the net electric flux equal to zero? - Answers C and D
An electric dipole consists of point charges q1=+12 nC and q2=-12 nC placed 10.0 cm apart. Compute
the electric potentials at points a, b, and c. - Answers Va= -900 V Vb=1930 V Vc=0
By integrating the electric field, find the potential at a distance r from a point charge q. - Answers
q/4piE0r
If the potential in a region is given by V(x,y,z) = xy - 3z-2, then the y component of the electric field in
that region is - Answers -x
When a positive charge moves in the direction of the electric field, - Answers the field does positive
work on it and the potential energy decreases.
When a negative charge moves in the direction of the electric field - Answers the field does negative
work on it and the potential energy increases.
When a negative charge moves opposite to the direction of the electric field, - Answers the field does
positive work on it and the potential energy decreases
When you rub a plastic rod with fur, the plastic rod becomes negatively charged and the fur becomes
positively charged. As a consequence of rubbing the rod with the fur, - Answers the rod gains mass
and the fur loses mass
An alpha particle has mass m=6.64x10-27 kg and charge q=2e=3.2x10-19C. Compare the magnitude of
the electric repulsion between the two α particles with that of the gravitational attraction between
them - Answers Fe/Fg = 3.1x 10^35
Three point charges lie at the vertices of an equilateral triangle as shown. All three charges have the
same magnitude, but charges #1 and #2 are positive (+q) and charge #3 is negative (-q). The net
electric force that charges #2 and #3 exert on charge #1 is in - Answers -y direction
A point charge q=-8.0 nC is located at the origin. Find the electric field vector at the field point x=1.2
m and y=-1.6 m. - Answers (-11N/c) i + (14 N/c) j
Two point charges and a point P lie at the vertices of an equilateral triangle as shown. Both point
charges have the same magnitude q but opposite signs. There is nothing at point P. The net electric
field that charges #1 and #2 produce at point P is in - Answers +y direction
Two point charges Q1 and Q2 of equal magnitudes and opposite signs are positioned as shown in the
figure. Which of the arrows best represents the net electric field at point P due to these two charges?
- Answers A
Three equal negative point charges are placed at three of the corners of a square of side d as shown
in the figure. Which of the arrows represents the direction of the net electric field at the center of the
square? - Answers C
Three point charges lie at the vertices of an equilateral triangle as shown. Charges #2 and #3 make up
an electric dipole. The net electric torque that charge #1 exerts on the dipole is - Answers clockwise
An electron is initially moving to the right when it enters a uniform electric field directed upwards.
Which trajectory shown below will the electron follow? - Answers trajectory z
Spherical Gaussian surface #1 has point charge +q at its center. Spherical Gaussian surface #2, of the
same size, also encloses the charge but is not centered on it. There are no other charges inside either
Gaussian surface. Compared to the electric flux through surface #1, the flux through surface #2 is -
Answers the same
Two point charges, +q (in red) and -q (in blue), are arranged as shown. Through which closed
surface(s) is/are the net electric flux equal to zero? - Answers surface C and D
Four dipoles, each consisting of a +10-µC charge and a -10-µC charge, are located in the xy-plane with
their centers 1.0 mm from the origin, as shown. A sphere passes through the dipoles, as shown in the
figure. What is the electric flux through the sphere due to these dipoles? - Answers 4.5 x 10^6
Nm^2/C
A cone is resting on a tabletop as shown in the figure with its face horizontal. A uniform electric field
of magnitude 4550 N/C points vertically upward. How much electric flux passes through the sloping
side surface area of the cone? - Answers 6.36 Nm^2/c
There is a negative surface charge density in a certain region on the surface of a solid conductor. Just
beneath the surface of this region, the electric field - Answers 0
Two point charges, +q (in red) and -q (in blue), are arranged as shown. Through which closed
surface(s) is/are the net electric flux equal to zero? - Answers C and D
An electric dipole consists of point charges q1=+12 nC and q2=-12 nC placed 10.0 cm apart. Compute
the electric potentials at points a, b, and c. - Answers Va= -900 V Vb=1930 V Vc=0
By integrating the electric field, find the potential at a distance r from a point charge q. - Answers
q/4piE0r
If the potential in a region is given by V(x,y,z) = xy - 3z-2, then the y component of the electric field in
that region is - Answers -x
When a positive charge moves in the direction of the electric field, - Answers the field does positive
work on it and the potential energy decreases.
When a negative charge moves in the direction of the electric field - Answers the field does negative
work on it and the potential energy increases.
When a negative charge moves opposite to the direction of the electric field, - Answers the field does
positive work on it and the potential energy decreases
