IB Physics SL D.2.3 Charge Conservation

Practise applying conservation of charge to contact or induction, tracking signed charge transfer and checking that total charge remains unchanged in an isolated system.

Exam points

sum signed charge before and after an interaction and equate totals for an isolated system
distinguish transfer of electrons from creation of net charge when objects are rubbed or connected
combine charge conservation with integer multiples of e when determining particle numbers

[Maximum number: 1]

The diagram shows a junction in a circuit.

Figure for Question D.2.3—Charge conservation question 1 — IB Physics SL

The currents in the three wires are related by $I_{1}=I_{2}+I_{3}$ .
State the fundamental law of Physics from which this relation is derived.

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D.2.3—Charge conservation question 1