If a nonzero current will be flowing in each of the coils. 十 十 2 2 i d i U,=L1-+M M dt dt dt di L,-2+M i 0= 2 L,-+M dt At a real frequency ((sinusoidal) V1=jOL I1+joM 12 VI=jOL, l1-jaM /2 V2=jaL2 12+joM I1 2=-jOL2 /2+joM I1If a nonzero current will be flowing in each of the coils. dt di M dt di L 2 1 2 = 2 + dt di M dt di L 1 2 1 = 1 + dt di M dt di L 1 2 1 = 1 − dt di M dt di L 2 1 2 = − 2 + At a real frequency (sinusoidal)  1 2 1 1 • • • V = jL I + jM I 2 1 2 2 • • • V = jL I + jM I 2 1 2 2 • • • V = − jL I + jM I 1 2 1 1 • • • V = jL I − jM I 2 i 1 L2 L − +  1   − +  2 1 i M 2 i 1 L2 L − +  1   − +  2 1 i M