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A solenoid has a core of a material with relative permeability 400 . The windings of the solenoid are insulated from the core and carry a current of 4 A. If the number of tums is 500 per metre, then the magnetizing field is

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$2 π \times 10^{3} {Am}^{- 1}$

$1 \times 10^{3} {Am}^{- 1}$

$4 \times 10^{3} {Am}^{- 1}$

$2 \times 10^{3} {Am}^{- 1}$

answer is D.

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Detailed Solution

$H = n I = 500 \times 4 = 2 \times 10^{3} A / m$

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