AP PHYSICS C: ELECTRICITY AND MAGNETISM Scoring Guide
Unit 2 Progress Check: MCQ
An isolated conducting sphere of radius is initially uncharged. A point charge is placed a distance from the center
of the sphere, as shown in the figure. Points 1 and 2 are points on the surface of the sphere such that the point charge
and points 1, 2, and all fall on the same line.
1. The electric field at point due to the point charge and the sphere is
(A) zero
(B)
(C)
(D)
(E)
2. Which of the following is a correct for the potential difference between the electric potentials at points 1
and 2 on the surface of the sphere and gives evidence to support this claim?
(A) , because the surface of the sphere is an equipotential surface.
(B) , because both points are the same distance from the center of the sphere.
(C) , because an excess charge of magnitude is induced on the surface of the sphere.
(D) , because both points are the same distance from the center of the sphere.
(E) , because an excess charge of magnitude is induced on the surface of the sphere.
AP Physics C: Electricity and Magnetism Page 1 of 26
, Scoring Guide
Unit 2 Progress Check: MCQ
A positively charged conducting spherical shell of radius is a distance away from a second positively charged
conducting spherical shell of radius , where . The two shells are connected by a thin metal wire, and the
equilibrium is established. At equilibrium, the small shell carries a charge and the large shell carries a charge , as
shown.
3. Which of the following is a correct equation relating the radii of the shells and the charges on the shells?
(A)
(B)
(C)
(D)
(E)
4.
Points , , and in the vicinity of the shells are shown in the figure. Points and are just outside the surface
of each sphere, and point is equidistant from both spheres. Which of the following indicates the point at which
the magnitude of the electric field is greatest and supplies evidence for the claim?
(A) Point , because is less than .
(B) Point , because is less than .
(C) Point , because the electric field from each sphere adds together at .
(D) Point , because is greater than .
(E) Point , because is greater than .
Page 2 of 26 AP Physics C: Electricity and Magnetism
, Scoring Guide
Unit 2 Progress Check: MCQ
In an experiment to investigate the properties of a capacitor, students connect a parallel plate capacitor to a variable
voltage source as shown.
5.
To determine how the electric field between the plates of the capacitor changes as the potential difference across the
plates changes, the students set up an electron emitter as shown to send a beam of electrons between the plates of
the capacitor. When the voltage is turned on, it is observed that the beam is deflected upward. As the voltage is
increased, the electrons are deflected more. Which of the following statements is supported by this observation?
AP Physics C: Electricity and Magnetism Page 3 of 26
Unit 2 Progress Check: MCQ
An isolated conducting sphere of radius is initially uncharged. A point charge is placed a distance from the center
of the sphere, as shown in the figure. Points 1 and 2 are points on the surface of the sphere such that the point charge
and points 1, 2, and all fall on the same line.
1. The electric field at point due to the point charge and the sphere is
(A) zero
(B)
(C)
(D)
(E)
2. Which of the following is a correct for the potential difference between the electric potentials at points 1
and 2 on the surface of the sphere and gives evidence to support this claim?
(A) , because the surface of the sphere is an equipotential surface.
(B) , because both points are the same distance from the center of the sphere.
(C) , because an excess charge of magnitude is induced on the surface of the sphere.
(D) , because both points are the same distance from the center of the sphere.
(E) , because an excess charge of magnitude is induced on the surface of the sphere.
AP Physics C: Electricity and Magnetism Page 1 of 26
, Scoring Guide
Unit 2 Progress Check: MCQ
A positively charged conducting spherical shell of radius is a distance away from a second positively charged
conducting spherical shell of radius , where . The two shells are connected by a thin metal wire, and the
equilibrium is established. At equilibrium, the small shell carries a charge and the large shell carries a charge , as
shown.
3. Which of the following is a correct equation relating the radii of the shells and the charges on the shells?
(A)
(B)
(C)
(D)
(E)
4.
Points , , and in the vicinity of the shells are shown in the figure. Points and are just outside the surface
of each sphere, and point is equidistant from both spheres. Which of the following indicates the point at which
the magnitude of the electric field is greatest and supplies evidence for the claim?
(A) Point , because is less than .
(B) Point , because is less than .
(C) Point , because the electric field from each sphere adds together at .
(D) Point , because is greater than .
(E) Point , because is greater than .
Page 2 of 26 AP Physics C: Electricity and Magnetism
, Scoring Guide
Unit 2 Progress Check: MCQ
In an experiment to investigate the properties of a capacitor, students connect a parallel plate capacitor to a variable
voltage source as shown.
5.
To determine how the electric field between the plates of the capacitor changes as the potential difference across the
plates changes, the students set up an electron emitter as shown to send a beam of electrons between the plates of
the capacitor. When the voltage is turned on, it is observed that the beam is deflected upward. As the voltage is
increased, the electrons are deflected more. Which of the following statements is supported by this observation?
AP Physics C: Electricity and Magnetism Page 3 of 26
