1.

The magnetic induction at the centre O in the figure shown is          [IIT 1988; KCET 2002]

A.            \[\frac{{{\mu }_{0}}i}{4}\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] 
B.            \[\frac{{{\mu }_{0}}i}{4}\left( \frac{1}{{{R}_{1}}}+\frac{1}{{{R}_{2}}} \right)\]
C.            \[\frac{{{\mu }_{0}}i}{4}({{R}_{1}}-{{R}_{2}})\]          
D.            \[\frac{{{\mu }_{0}}i}{4}({{R}_{1}}+{{R}_{2}})\]
Answer» B.            \[\frac{{{\mu }_{0}}i}{4}\left( \frac{1}{{{R}_{1}}}+\frac{1}{{{R}_{2}}} \right)\]


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