Q2ANS

 Answer

Current I₁ is R-phase current which is 5 Amps.

Current I₂ is sum of current of R-phase & Y-phase. They are 5 Amps each but 120 degree apart. Vector sum of these two is also 5 Amps as shown hereunder in vector diagram.

Current I₃ is sum of currents in B-phase & Current I₂ (Sum of R-phase & Y-phase). As these current are equal and opposite, vector sum is zero.

                

Vector Diagram

                 Ultimtely            

                I₁ = 5 Amps

                I₂ = 5 Amps

                I₃ = 0 Amps