Physics

Problem

A conducting sphere of radius 0.20 m is charged so that the electric field just outside its surface has magnitude 9.0 × 10⁴ N/C. What surface charge density σ must the sphere carry? a)

1.6\times10^{-6}\ \text{C/m}^2

4.0\times10^{-7}\ \text{C/m}^2

8.0\times10^{-7}\ \text{C/m}^2

1.6\times10^{-7}\ \text{C/m}^2

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