1.

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
Answer» C.         7 W                                   


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