E
U
0
q
r R12
4 0 r 0 R2 r R3 q Q r R3 2 4 0 r U1 r R1 q 1 1 q Q ( ) 4 0 r R2 4 0 R3 q Q R2 r R3 4 0 R3 q Q r R3 0 r
R1 r R2Q
U1 R2
R1
R3
R1 r R2
E
U
0
q
r R12
4 0 r 0 R2 r R3 q Q r R3 2 4 0 r U1 r R1 q 1 1 q Q ( ) 4 0 r R2 4 0 R3 q Q R2 r R3 4 0 R3 q Q r R3 0 r
R1 r R2Q
U1 R2
R1
R3
R1 r R2
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