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If a 3 A current source lies in the common branch of mesh currents I1 and I2 and its direction corresponds to I1-I2, the mesh-current constraint is?

  • AI1+I2=3
  • BI1-I2=3
  • CI2-I1=0
  • DI1I2=3
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Correct Answer: B. I1-I2=3
Explanation: With the specified direction convention, the branch current is I1-I2, and the current source fixes this difference at 3 A.
Reference: Standard network theory: supermesh constraint
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