(A) U1 – U2
(B) 1/U1 – 1/U2
(C) 1/U2 – 1/U1
(D) U2 – U1
(A) U1 – U2
(B) 1/U1 – 1/U2
(C) 1/U2 – 1/U1
(D) U2 – U1
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