1.

The magnetic moment of a current carrying loop is \[2.1\times {{10}^{-25}}\,amp\times {{m}^{2}}\]. The magnetic field at a point on its axis at a distance of \[1\,{AA}\] is

A. \[4.2\times {{10}^{-2}}\,weber/{{m}^{2}}\]      
B. \[4.2\times {{10}^{-3}}\,weber/{{m}^{2}}\]
C. \[4.2\times {{10}^{-4}}\,weber/{{m}^{2}}\]      
D. \[4.2\times {{10}^{-5}}\,weber/{{m}^{2}}\]
Answer» B. \[4.2\times {{10}^{-3}}\,weber/{{m}^{2}}\]


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