A solenoid has core of a material with relative permeability 400 . ...

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A solenoid has core of a material with relative permeability 400 . The windings of the solenoid are insulated from the core and carry a current of \( 2 \mathrm{~A} \).
If the number of turns is 1000 per metre,
In the above question, \( B \) and the magnetising current is
(a) \( 1.0 \mathrm{~T}, 794 \mathrm{~A} \)
(b) \( 4.2 \mathrm{~T}, 594 \mathrm{~A} \)
(c) \( 2.9 \mathrm{~T}, 698 \mathrm{~A} \)
(d) \( 1.9 \mathrm{~T}, 494 \mathrm{~A} \)
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