All the resistances in the figure are 1 ohm each.The value of current 'I' is

All the resistances in the figure are 1 ohm each.The value of current 'I' is  ( GATE-EE-1992)

A. 1/15A
B. 2/15A
C. 4/15A
D. 8/15A

Answer:

Given R = 1, v = 1
After reduction , we get  Req = 1.875

I = 1 / 1.875 = 0.533 = 8/15 A