A palindrome is a number or a text phrase that reads the same backwards as forwards. For example, each of the following five-digit integers is a palindrome: 12321, 55555, 45554 and 11611. Write a C++ program that reads in a five-digit integer and determines whether it is a palindrome .

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 Question

find the inductance per km of a three-phase transmission line using 0.2 cm diameter conductors when these are placed at the corners of an equilateral triangle of each side 1 m.

Solution

Step 1

Given Data:

D = distance between the condutor = 1m

Radius of the conductor r = 0.2 / 2 = 0.1 cm = 1 x 10^-3 m

 

Step 2

Effective radius r' = 0.7788 r  = 0.7788 x 1 x 10^-3  = 0.7788 x 10^-3  m

$$\begin{gathered} Induc\tan ce per phase = 2 x {10}^{-4} \ln \left(\frac{D}{r\text{'}}\right) H/km \\ = 2 x {10}^{-4} \ln \left(\frac{1}{0.7788 x {10}^{-3}}\right) \\ \mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{=}\mathbf{ }\mathbf{1}\mathbf{.}\mathbf{431}\mathbf{ }\mathit{x}\mathbf{ }{\mathbf{10}}^{\mathbf{-}\mathbf{3}}\mathbf{ }\mathit{H}\mathbf{/}\mathit{k}\mathit{m}\mathbf{ }\mathbf{ } \end{gathered}$$