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The magnetic induction at a point P which is at a distance of 4 cm from a long current carrying wire is 10-3 T. The field of induction at a distance 12 cm from the current will be
(a) 3.33 × 10-4 T
(b) 1.11 × 10-4 T
(c) 3 × 10-3 T
(d) 9 × 10-3 T
(a)
As the distance is increased to three times, the magnetic induction reduces to one third.
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