If a power utility were able to replace an existing 500 kV transmission line with one operating at 1 MV, it would change the amount of heat produced in the transmission line to
a four times the previous value.
b two times the previous value.
c one-fourth of the previous value.
d The amount of heat produced would remain the same.
e one-half of the previous value.
f none of these.
Answer:
Option C is the correct answer
Explanation:
When the voltage is 500kV
The power is
When the voltage is 1MV = 2 × 500kV
The power is
The ratio at which power is lost is
Here Resistance is constant
Hence the heat produced would be one fourth of the previous value
To solve this problem we will use Snell's law. This law is used to calculate the angle of refraction of light by crossing the separation surface between two means of propagation of light (or any electromagnetic wave) with a different index of refraction.
Where,
= Index of refraction for each material
= Angle of incidence and refraction
A ray of light propagating in a medium with index of refraction hitting an angle on the surface of a medium of index with can be fully reflected inside the medium of highest refractive index:
Refractive index of rarer medium
Refractive index of denser medium
Replacing we have,
the critical angle of this fiber at the glass-plastic interface is 60.07°