i1R1−i2R4=E1−E2i_1R_1-i_2R_4=E_1-E_2i1R1−i2R4=E1−E2
i1R1+i3R4=E1−E2i_1R_1+i_3R_4=E_1-E_2i1R1+i3R4=E1−E2
i1R1−i3R4=E1+E2i_1R_1-i_3R_4=E_1+E_2i1R1−i3R4=E1+E2
i1R1+i3R4=E1+E2i_1R_1+i_3R_4=E_1+E_2i1R1+i3R4=E1+E2
No correct answer\text{No correct answer}No correct answer