A wire of resistance R is bent to form a square ABCD as shown in the figure. The effective resistance between E and C is : (E is mid−point of arm CD)


(a) 
(b) 
R 

(c) 
(d) 
A wire of resistance R is bent to form a square ABCD as shown in the figure. The effective resistance between E and C is : (E is mid−point of arm CD)


(a) 
(b) 
R 

(c) 
(d) 