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ELECTROMAGNET

H=NI/l

H- magnetic field strength
N- number of coils
I- current
l-length of the magnet core

R=ro*L/S

R- resistance
ro-specific resistance of the material
L-length of the wire
S-surface of wire cross section

S=r^2*Pi

S-surface of wire cross section
r-diametar half of the wire
Pi= 3.1416

Since magnetic field strength is proportional to NI product if you want to make a sronger magnet you are suppose to increase N.
But if you increase N you increase L and with it R and decrease I.So when you increase N you are suppose to increase S.

If you want to double the strength of the magnet you do this:
-N*2
-r*sqrt(2) or d*sqrt(2)

d-diameter of the wire
sqrt- square root function

If you want n times stronger magnet you do this:
-N*n
-d*sqrt(n)



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