AP · AP 2 · multiple choice
AP Physics 2: Algebra-Based · Question 2
AP Physics 2: Algebra-Based · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 1
- Topics
- 1
- Answer
- Complete
Two point charges, +Q and −Q, are held a distance d apart. What are the electric field and the electric potential at the midpoint between them, taking the potential to be zero at infinity?
- A
field zero, potential zero
- B
field zero, potential non-zero
- C
field non-zero, potential zero
- D
field non-zero, potential non-zero
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Answer and reasoning
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is C: field non-zero, potential zero
- 2
A is the commonest answer and gets exactly one of the two wrong. The field contributions are vectors that both point from the positive charge towards the negative one, so they add; the potentials are scalars of equal size and opposite sign, so they cancel.
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