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## Homework Statement

The first question asks: What is the electric field when the radius of a sphere is R. For this first question I put [itex]E=k\frac{Q}{R^2}[/itex] and got the question correct.

The second question simply states: What is the electric field at r=R/2. I used Coulomb's law, Gauss' law, and common sense and every time got: [itex]E=k\frac{4Q}{R^2}[/itex] but there are no choices that match my answer.

Also there are no choices of [itex]E=\frac{Q}{ε_0πR^2}[/itex]

Am I doing something wrong?