AP Physics C: Electricity and Magnetism Page 1 of 32
AP PHYSICS C ELECTRICITY AND MAGNETISM Unit 1 Progress Check MCQ and Scoring Guide. Latest Update 2023.
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Unit 1 Progress Check: MCQ
Three identical point charges form an equilateral triangle with sides of length , as shown. The magnitude of the net force acting on each point charge is , and the potential energy of the system of charges is . One of the three point charges is then replaced by one with a charge .
- If and , what is the magnitude of the net force on the point charge?
(A) Zero (B) (C)
- Which of the following a correct expression for the potential energy of the system of three point charges in
?(A) (B) (C) (E) Zero (E) (D)
(D) 1 / 4
Scoring Guide
AP Physics C: Electricity and Magnetism Page 2 of 32
Unit 1 Progress Check: MCQ
Two point charges with charges and are separated by distance . Several equipotential lines near the point charges and labeled points , , , and are shown in the figure.
- Which of the following correctly ranks the magnitudes of the electric field at the four labeled points from largest to
smallest?(A) (B) (C) (E)
(D) 2 / 4
Scoring Guide
AP Physics C: Electricity and Magnetism Page 3 of 32
Unit 1 Progress Check: MCQ
4.
A third point charges of charge is brought in from a large distance away and placed a distance from each of the two original point charges, as shown above. Which of the following expressions is correct for the change of electric potential energy from the two-point charges system to the three-point charges system?(A) The electric potential energy is decreased by .(B) The electric potential energy is decreased by .(C) The electric potential energy is increased by .
5.
Two point charges are held at rest on the -axis of a coordinate system as shown above. The first point charge is located at and has a charge of μ . The second point charge is located at and has a charge of μ . Where must a third point charge with charge μ be placed so that the net force on it is zero?(E) The electric potential energy is increased by .(D) The electric potential energy is increased by . 3 / 4
Scoring Guide
AP Physics C: Electricity and Magnetism Page 4 of 32
Unit 1 Progress Check: MCQ
(A) (B) (C) (D)
6.
Three point charges, each with charge of magnitude , are arranged in a line as shown. If the net force on the middle charge is , what is the approximate value of ?(A) (B) (C)
- Point charges 1 and 2 have charges and and are held apart. The point charges exert an attractive
- / 4
force of on each other. Which of the following are possible values for the charges?(A) and (B) and (E) and (E) (E) (D) (D) and (C) and