A solenoid of 1000 turns per metre has a core with relative permeability 500. Insulated winding of the solenoid carry an electric current of 5 A. The magnetic flux density produced by the solenoid is: (permeability of free space =4π×10−7H/m)

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2×10−3π T

10−4π T

π5T

π T

answer is D.

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Detailed Solution

Magnetic flux density =B=μni=μ0μrni =5004π×10−710005=10000000π×10−7 =π T

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