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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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