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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 
(a)   3.33×10-9 Tesla                              (b) 1.11×10-4 Tesla
(c)    3×10-3     Tesla                              (d)  9×10-2    Tesla