Question

Find the resistance of a wire frame shaped as a cube (Fig. 3.35) when measured between points 

(a) 1-7; (b) 1-2; (c) 1-3. 

The resistance of each edge of the frame is R

Answer 1

(a) The currents are as shown. From Ohm's law applied between 1 and 7 via 1487 (say)

(b) Between 1 and 2 from the loop 14321,

(c) Between 1 and 3 From the loop 15621