An iron rod of susceptibility 599 is subjected to a magnetising field of 1200 A m -1 . The permeability of the material of the rod is : ( 0 = 4 10 -7 T m A -1 )

1. A. 8.0 10 -5 T m A -1
2. B. 2.4 10 -5 T m A -1
3. C. 2.4 10 -7 T m A -1
4. D. 2.4 10 -4 T m A -1

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