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IB Physics HL B.5.9 Current and charge flow Question Bank

Practise IB Physics HL B.5.9 by analysing charge continuity, carrier drift and current in wires, liquids, satellites and illuminated devices.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • Combine I=ΔQ/Δt with I=nqAv to analyse carrier flow, discharge and drift through changing cross-sections.
  • Explain why charge transfer needs a complete circuit and relate current to electron emission or pixel potential change.

B.5.9—Current and charge flow question 1

[Maximum number: 3]

A cable consisting of many copper wires is used to transfer electrical energy from an alternating current (ac) generator to an electrical load. The copper wires are protected by an insulator.

Figure for Question B.5.9—Current and charge flow question 1 — IB Physics HL

The copper wires and insulator are both exposed to an electric field. Discuss, with reference to charge carriers, why there is a significant electric current only in the copper wires.

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