AP PHYSICS C ELECTRICITY AND MAGNETISM Unit 1 Progress Check MCQ and Scoring Guide. Latest Update 2023. (GUARANTEED PASS

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 . (GUARANTEED PASS) 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 . 1. If and , what is the magnitude of the net force on the point charge? (A) Zero (B) (C) 2. 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) 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. 3. 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) 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 . 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) 7. Point charges 1 and 2 have charges and and are held apart. The point charges exert an attractive 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