D.2 Electric and magnetic fields Quiz
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5 questions, one answer each
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1. The electric potential 0.50 m from a point charge is +360 V. At 1.0 m it is:
- A. +90 V
- B. +180 V
- C. +360 V
- D. +720 V
2. A proton moves from a point at +100 V to a point at +40 V. The work done by the field on it is:
- A. −9.6 × 10⁻¹⁸ J
- B. +9.6 × 10⁻¹⁸ J
- C. +6.4 × 10⁻¹⁸ J
- D. zero
3. Two like charges are pushed closer together. Their electric potential energy:
- A. decreases
- B. increases
- C. stays the same
- D. becomes negative
4. No work is done when a charge moves:
- A. along a field line
- B. along an equipotential surface
- C. from infinity to a point
- D. between parallel plates
5. At the midpoint between two equal positive charges:
- A. E = 0 and V = 0
- B. E = 0 and V ≠ 0
- C. E ≠ 0 and V = 0
- D. E ≠ 0 and V ≠ 0