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Bz

 Bz

Bx

 Bx

Bz

 Bz

(a) 3He cancels the external field Bz

 (a) 3He cancels the external field Bz

(b) 3He compensates for Bx

 (b) 3He compensates for Bx

I3He

 I3He

M3He

 M3He

Bz

 Bz

SK

 SK

MK

 MK

I3He

 I3He

M3He

 M3He

B

 B

SK

 SK

MK

 MK

K feels no change

 K feels no change

K feels no field

 K feels no field