The kinetic energy of an electron in the $n^{th}$ orbit of a hydrogen-like species with atomic number $Z$ is $13.6 \frac{Z^2}{n^2} \ eV$. The potential energy of this electron in the same orbit will be:
- A$+27.2 \frac{Z^2}{n^2} \ eV$
- B$-6.8 \frac{Z^2}{n^2} \ eV$
- C$13.6 \frac{Z^2}{n^2} \ eV$
- D$-27.2 \frac{Z^2}{n^2} \ eV$
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