1.

Two wires are wrapped over a wooden cylinder to form two coaxial loops a carrying current\[{{i}_{1}}\] and\[{{i}_{2}}\]. If \[{{i}_{2}}=8{{i}_{1}}\] the value of x for B = 0 at the origin O is:        

A. \[\sqrt{(\sqrt{7}}-1)R\]    
B. \[\sqrt{5}R\]
C. \[\sqrt{3}R\]                  
D. \[\sqrt{7}R\]
Answer» E.


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