1.

The magnetic induction in air at a point 1cm away from a long wire that carries a current of 1A, will be [BHU 1999]

A.    \[1\times {{10}^{-5}}T\]  
B.    \[2\times {{10}^{-5}}T\]
C.    \[3\times {{10}^{-5}}T\]  
D.    \[4\times {{10}^{-5}}T\]
Answer» C.    \[3\times {{10}^{-5}}T\]  


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