question_answer

The equivalent resistance between points A and D is (given wire used is idle)

A)  zero                             

B)  R

C)  2 R                             

D)  None of these

Correct Answer: C

Solution :

As the wire is idle so resistor between B and C has same potential so it is useless, \[\therefore \] Equivalent figure is \[\therefore \] Equivalent resistance between A and \[\operatorname{D}= 2R\]