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.PS
# https://tex.stackexchange.com/questions/593866/magnetic-field-with-2-coils
cct_init(SIdefaults)
setdir_(R)
W1: winding(,20,5,8,10)
line dn_ 10 from W1.T1; dot(,,1)
line dn_ 10 from W1.T2; dot(,,1)
W2: winding(,20,5,8,10) with .w_ at W1.e_+vec_(10,0)
line dn_ 10 from W2.T1; dot(,,1)
line dn_ 10 from W2.T2; dot(,,1)
for i=2 to -2 by -1 do {
spline 0.55 \
from W2.e_+vec_(30,10/4*i*3) \
to W2.e_+vec_(25,10/4*i*2) \
then to W2.e_+vec_(0,10/4*i) \
then to W1.w_+vec_(0,10/4*i) \
then to W1.w_+vec_(-25,10/4*i*2) \
then to W1.w_+vec_(-30,10/4*i*3)
arrow wid 2 ht 2 dn_ i*0.66 rt_ 2 at W1.w_+vec_(-25,10/4*i*2.35)
arrow wid 2 ht 2 up__ i*0.66 rt_ 2 at W2.e_+vec_(25,10/4*i*2.35)
}
.PE
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