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## Homework Statement

what is the magnitude or a point charge whose electric field 50cm away has the magnitude 2nc?

## Homework Equations

E=1/4pi.epsilon sub zero q absolute/r sqrt2

1/4pi.epsilon sub zero=8.99x10sqrt9

## The Attempt at a Solution

that gives me 71.92 and my solution in the book says 56pC am I wrong?