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Two point charges q and -q are separated...

Two point charges q and -q are separated by a distance 2a. Evaluate the flux of the electric field strength vector across a circle of radius R.

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The correct Answer is:
`|phi|=q/epsi_(0) (1-1/sqrt(1+(R//l)^(2)))`. Then sign of `phi` depends on how the direction of the normal to the circle is chosen.
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