Point PP is a distance d1d1 = 4.0 mm above a large sheet of metal that carries a current of 35 AA in the positive xx direction and a distance d2d2 = 3.0 mm below a very long wire that carries a current of 0.41 AA in the positive xx direction. If the magnetic field magnitude at P is zero, calculate the width of the metal sheet.

The width of the sheet is  

Explanation:

  From the question we are told that

             The distance of point P above a  large sheet of metal is

             The current on the large metal sheet  is  

              The  distance of the the point P below a long wire

               The current on the long wire is  

                The magnetic field at  P is  

Generally magnetic field  of P long wire is mathematically represented as

Generally magnetic field  of P large sheet of meta is mathematically represented as

Where K is the current per unit width

 The total magnetic field at P is

Making K the subject of formula

 Substituting values

Generally K is mathematically represented as

Where w is the width of the large sheet

Therefore the width  of the metal sheet  

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