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Disadvantages of A.C. Transmission of power
1. An a.c. line needs more copper than a d.c. line.
2. The construction of an a.c. transmission line is more complex than d.c. transmission line.
3. Because of skin effect in the a.c. system, the effective resistance of the line is enhanced.
4. An a.c. line has capacitance. Thus, there is a continuous loss of power because ofcharging current even when the line is open.
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Disadvantages of Low Power factor Greater conductor size : To transfer or distribute a fixed amount of power at constant voltage, the conductor will have to carry more current
derive an expression for the total cross section for the scattering of light by a polorisable molecule in term of the incedent wave length.
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