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Resolução - Halliday - Volume 3 - Eletricidade E Magnetismo - P23 022

Exercícios Resolvidos.

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22. We find the maximum by differentiating Eq. 23-16 and setting the result equal to zero.   d qz R2 − 2z 2 q = =0 dz 4πε0 (z 2 + R2 )3/2 4πε0 (z 2 + R2 )5/2 √ which leads to z = R/ 2.