Kirchhoff's Current Law
At a junction in a circuit, currents of 3 A, 2 A, and 4 A enter the junction. If one current of 5 A leaves the junction, what is the magnitude of the other outgoing current?
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- kirchhoff's current law
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
4 A
- Kirchhoff's First Law (Junction Rule): Sum of all currents entering a junction must equal the sum of all currents leaving that junction.
- Based on the Conservation of Charge.
- Identify Entering Currents:
- Iin=3 A+2 A+4 A=9 A.
- Identify Leaving Currents:
- Iout=5 A+Iunknown.
- Equate and Solve:
- 9 A=5 A+Iunknown
- Iunknown=4 A.
- Result: The second outgoing current is 4 A.
This easy difficulty physics question is from the chapter current electricity, covering the topic of kirchhoff's current law. It appeared in the 2025 exam.
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