Calculating Flux Density: 400-Turn Coil with GO Steel Core and Current of 500mA

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Homework Statement


A 400 turn coil wound over a length of 30mm has a core GO steel and has a current of 500mA
flowing through it. Find the density of the flux produced.


Homework Equations


N=400, I=0.05, l=0.03 F= IN ; Φ=F/Rm ; B=Φ/A ; Rm=


The Attempt at a Solution



F=20 At
 
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I believe that " A " is missing
A = the cross sectional area in metres squared
 
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