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AP Physics C E&M 11.7 Kirchhoff's Junction Rule

Practise applying charge conservation at circuit junctions by matching currents entering and leaving a node and comparing ideal ammeter readings.

Syllabus
Effective Fall 2024
Course
AP Physics C: Electricity & Magnetism

Exam points

  • Apply sum I_in=sum I_out at a circuit junction to identify equal ideal-ammeter readings.

Covered syllabus points

11.7.A—Describe a circuit or elements of a circuit by applying Kirchhoff’s junction rule

11.7 Kirchhoff’s Junction Rule question 1

[Maximum number: 1]

Questions 19-21

Figure for Question 11.7 Kirchhoff’s Junction Rule question 1 — AP Physics C: Electricity & Magnetism

Two 9 V batteries and three identical 600Ω600 \Omega resistors are connected in a circuit, as shown above. Neglect internal resistance in the batteries and consider all meters to be ideal.

Ammeters are inserted at points I, II, III, and IV. At which of the other points would the ammeter register the same current as the ammeter at point IV ?

A

I only

B

III only

C

I and II only

D

II and III only

E

I, II, and III

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