Find the equivalent resistance of the networks shown in figure (32-E21) between the point a and b.
figure (32-E21)
(a) Reff=5r3×r5r3+r=5r8
(b) Reff=(r3)+r=4r3
(c) Reff=(2r2)=r
(d) Reff=r4
(e) Reff=r