A solenoid of 1000 turns per metre has ...

A solenoid of 1000 turns per metre has a core with relative permeability 500. Insulated windings of the solenoid carry an electric current jof 5A. The magnetic flux density produced by the solenoid is `:` ( permeability of free space `= 4 pi xx 10^(-7) H //m ` )

`( pi )/( 5) T`

`10^(-4) pi T `

`pi T`

`2 xx 10^(-3) pi T`

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