Physics-
General
Easy

Question

The value of current I in figure is

  1. 4A    
  2. 6A    
  3. 3A    
  4. 5A    

The correct answer is: 4A


    From Kirchhoff’s first law, in an electric circuit the algebraic sum of the currents meeting at any junction is zero,

    i e. comma blank sum i equals 0
    ∴ Taking inward direction of current as positive and outward as negative, we have
    1 A minus 3 A minus 2 A plus I equals 0
    ⟹ I equals 4 A

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