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**[Ignore]How to derive magnitude of Electric field to this?**

## Homework Statement

My book states that

[tex]|E| = \frac{2kQ}{d^2} = 2\pi k\sigma [/tex]

I thought k, the coulomb constant is [tex]\frac{1}{4\pi\epsilon0}[/tex]

## Homework Equations

## The Attempt at a Solution

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