4.6. A single-phase 60-Hz overhead power line is symmetrically supported on a horizontal cross arm. Spacing between the centers of the conductors (say, a and b) is 2.5 m.A telephone line is also symmetrically supported on a horizontal cross arm 1.8 m directly below the power line. Spacing between the centers of these conductors(say, c and d) is 1.0 m.CE (a) Using Eq. (4.36), show that the mutual inductance per unit length between circuit a-b and circuit c-d is given by where, for example, Dd denotes the distance in meters between conductors aand d. (b) Hence, compute the mutual inductance per kilometer betwcen the power line and the telephone line. (c) Find the 60-Hz voltage per kilomcter induccd in the telephone linc when thepower linc carrics 150 A.

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