question_answer

Four wires AB, BC, CD, DA of resistance 4 ohm each and a fifth wire BD of resistance 8 ohm are joined to form a rectangle ABCD of which BD is a diagonal. The effective resistance between the points A and B is              [MP PMT 1994]

A)            24 ohm

B)                                      16 ohm

C)                    \[\frac{4}{3}ohm\]     

D)            \[\frac{8}{3}ohm\]