First slide

Electrostatic potential

Question

In an hydrogen atom, the electron revolves around the nucleus in an orbit of radius 0.53 x 10^-10m. Then the electrical potential produced by the nucleus at the position of the electron is

Moderate

A

-13.6 V
B

-27.2 V
C

27.2 V
D

13.6 V

Solution

$V = 9 \times 10^{9} \times \frac{Q}{r} = 9 \times 10^{9} \times \frac{(+ 1.6 \times 10^{- 19})}{0.53 \times 10^{- 10}} = 27.2 V$

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