(a) In the circuit shown in figure, all resistances are identical when a `5 V` supply is connected across AB the current in branch CG is 3 mA. Find the effective resistancce if the circuit between A and B

(b) Twelve equal resistances, each equal to R, are placed along the sides of a cube. Find equivalent resistance across.
(i) Diagonally opposite points of the cube
(ii) Diagonally opposite point on one face of the cube
(iii) End points of a side of the cube.

Answer

(a) `500 Omega`
(b) (i) `(5R)/(6)`
(ii) `(3R)/(4)
(iii) `(7R)/(12)`