- #1

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**is this a correct mathematical solution??**

question:

http://i40.tinypic.com/2hwcswm.gif

solution:

[tex]

\sigma=\frac{7.5\mu c}{14}=0.53571428571428571428571428571429\mu c\\

[/tex]

[tex]

14=2\pi r\\

[/tex]

[tex]

r=\frac{14}{\pi}\\

[/tex]

[tex]

dq=\sigma r d\theta \\

[/tex]

[tex]

k\sigma r\int_{0}^{\pi}d\theta=k\sigma r (\pi-0)=...

[/tex]

is it a correct solution?