IB Physics HL B 5 9 Direct Current and Charge Flow Questions

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

Exam points

Identify proper time and proper length as invariant measurements in the rest frame.
Apply time dilation and length contraction to calculate observed intervals using complete mark-scheme evidence.

[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 IB Physics HL B 5 9 Direct Current and Charge Flow Questions 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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IB Physics HL B 5 9 Direct Current and Charge Flow Questions question 1