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
 

Thread 'Modeling a graph that shows age in relation to depth of an ice sample'

To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.
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