question_answer

Four resistances 10 W, 5 W, 7 W and 3 W are connected so that they form the sides of a rectangle AB, BC, CD and DA respectively.  Another resistance of 10 W is connected across the diagonal AC. The equivalent resistance between A and B is                                                               [EAMCET (Med.) 2000]

A)         2 W                                   

B)         5 W

C)         7 W                                   

D)         10 W

Correct Answer: B

Solution :

                                         The figure can be drawn as follows Þ \[{{R}_{AB}}=5\Omega \].