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IB Physics HL D 2 1 Electric Charge Forces Questions

Practise IB Physics HL D.2.1 by solving force direction and resultant-charge problems in multi-particle electric systems.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • Determine resultant force direction for several positive and negative charges.
  • Explain charge-driven motion of ions and electrons from force directions.
  • Analyse symmetry and superposition in multi-charge force arrangements.

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Study D.2.1—Electric charge forces conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics HL D 2 1 Electric Charge Forces Questions question 1

[Maximum number: 2]

Ion-thrust engines can power spacecraft. In this type of engine, ions are created in a chamber and expelled from the spacecraft. The spacecraft is in outer space when the propulsion system is turned on. The spacecraft starts from rest.

Figure for Question IB Physics HL D 2 1 Electric Charge Forces Questions question 1 — IB Physics HL

The mass of ions ejected each second is 6.6×10−6 kg6.6 \times 10^{-6} \mathrm{~kg} and the speed of each ion is 5.2×104 m s−15.2 \times 10^{4} \mathrm{~m} \mathrm{~s}^{-1}. The initial total mass of the spacecraft and its fuel is 740 kg . Assume that the ions travel away from the spacecraft parallel to its direction of motion.

In practice, the ions leave the spacecraft at a range of angles as shown.

Figure for Question IB Physics HL D 2 1 Electric Charge Forces Questions question 1 — IB Physics HL

Outline why the ions are likely to spread out.

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