1.

The magnetic induction at a point P which is distant 4 cm from a long current carrying wire is \[{{10}^{-8}}\,Tesla\]. The field of induction at a distance 12 cm from the same current would be         [CBSE PMT 1990; DPMT 2001]

A.            \[3.33\times {{10}^{-9}}\,Tesla\]    
B.            \[1.11\times {{10}^{-4}}\,Tesla\]
C.            \[3\times {{10}^{-3}}\,Tesla\]          
D.            \[9\times {{10}^{-2}}\,Tesla\]
Answer» B.            \[1.11\times {{10}^{-4}}\,Tesla\]


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