single$-$phase $60-$Hz overhead line is symmetrically supported on a horizontal crossarm. Spacing between the centers of the conductors $($a and b$)$ is $3$m$.$ A telephone line is also symmetrically supported on the a horizontal crossarm $1\mathrm{.}2$m directly below the power line. Spacing between the centers of these conductors $($c and d$)$ is $1\mathrm{.}0$m$.3$m @ $1\mathrm{.}2$ d $1$m Din a$.$ Compute the mutual inductance per kilometer between the power line and the telephone line. $(10$ Points$)$ Hint: Use $11=2$ x $10-7(11$ In $=+1,$ in $.+13$ In $+...+$In In D$12$ D$18$ for flux linkage of each conductor and set telephone line current to zero. b$.$ Find the $60$Hz voltage per kilometer induced in the telephone line when the power line carries $150$A$.(10$ Points$)$ C$.$ C