Final answer:
The question pertains to Physics and involves calculating the vertical sag of a transmission line at the High School level, but it is not possible to provide a correct answer due to inaccuracies and missing relevant information in the problem statement.
Step-by-step explanation:
The subject of the question relates to Physics, and it involves the calculation of the vertical sag of a transmission line, which is a problem typically encountered at High School level in physics or engineering courses. To solve this problem, we would need to apply principles from mechanics and possibly calculus if the problem requires integrating a curve shape. However, the supplied information and question already contain several errors and inconsistencies, such as mentioning the specific gravity in gram per cubic centimeter for a channel, which does not directly relate to the vertical sag calculation of a transmission line.
Without an accurate formula and the necessary variables directly related to sag calculation (like weight per unit length of the conductor, span length, and tension in the conductor), it is not possible to provide a verifiable and correct answer to the problem as stated. Accurate determination of the sag requires considering force balance on the conductor, the effect of wind pressure, and the conductor's physical properties such as weight, tension, and span between towers.