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Current Electricity — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsCurrent Electricity1 Mark
MCQ
Calculate the value of current I4.
Image
  • A
    -9A
  • B
    9A
  • C
    5A
  • D
    1A
✓

Answer

  1. 9A

Explanation:

Current I4 can be calculated using Kirchhoff’s first law. The sum of current arriving at a junction is equal to the currents leaving the junction.

Here, Currents arriving at a junction: 7A + 5A = 12A

Currents leaving the junction: 3A + I4

Equating both the currents: 12A = 3A + I4

I4 = 9A

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