In the following circuits, pn junction, diodes D1, D2 and D3 are ideal for the following potential of A and B, the correct increasing order of resistance between A and B will be(i) -10 V, 5 V (ii)  -5 V, -10 V (iii) -4 V, -12 V

(i) VA=-10 V and VB=-5 VDiodes D1 and D3 are reverse biased and D2 is forward biased.⇒RAB=R+R4+R4=32R(ii) VA=5 V and VB=-10 VDiodes D2 is reverse biased and D1 and D3 are forward biased.⇒RAB=R4+R2+R4=R(iii) In this case, equivalent resistance between ,A and B is also R.Hence correct order is (ii) = (iii) < (i).