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Found in: Page 125

### Matter & Interactions

Book edition 4th edition
Author(s) Ruth W. Chabay, Bruce A. Sherwood
Pages 1135 pages
ISBN 9781118875865

# A proton and an electron are separated by ${\mathbf{1}}{\mathbf{×}}{{\mathbf{10}}}^{\mathbf{-}\mathbf{10}}{\mathbf{}}{\mathbf{m}}$ the radius of a typical atom. Calculate the magnitude of the electric force that the proton exerts on the electron and the magnitude of the electric force that the electron exerts on the proton.

The magnitude of the force that the proton exerts on the electron is $2.304×{10}^{-8}\mathrm{N}$.

The magnitude of the force that the electron exerts on the proton is $2.304×{10}^{-8}\mathrm{N}$.

See the step by step solution

## Step 1: Definition of Coulomb's law.

Coulomb's law is the most fundamental in electrostatics. This law determines the force one charged particle exerts over the other and vice versa. The physical expression of this law is:

${\mathbf{F}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{4}{\mathbf{\pi \epsilon }}_{\mathbf{0}}}\frac{{\mathbf{q}}_{\mathbf{1}}{\mathbf{q}}_{\mathbf{2}}}{{\mathbf{r}}^{\mathbf{2}}}$

Here, r is the distance between two charged particles, and q is the charges.

## Step 2: Determine the proton's force exerted on the electron.

As it is known that the charge of the electron is ${\mathrm{q}}_{1}=-1.6×{10}^{-19}\mathrm{C}$

It is also known the charge of the proton is data-custom-editor="chemistry" ${\mathrm{q}}_{2}=+1.6×{10}^{-19}\mathrm{C}$

It is given that the separation between the electron and proton is data-custom-editor="chemistry" $\mathrm{r}=1×{10}^{-10}\mathrm{m}$.

It is known that the force can be determined as:

data-custom-editor="chemistry" $\begin{array}{rcl}\left|\mathrm{F}\right|& =& \left|\frac{1}{4{\mathrm{\pi \epsilon }}_{0}}\frac{{\mathrm{q}}_{1}{\mathrm{q}}_{2}}{{\mathrm{r}}^{2}}\right|\\ & =& 9×{10}^{9}×\frac{{\left(1.6×{10}^{-19}\right)}^{2}}{{\left(1×{10}^{-10}\right)}^{2}}\\ & =& 2.304×{10}^{-8}\mathrm{N}\end{array}$

## Step 3: Determine the electron's force exerted on the proton.

As it is known that the charge of the electron is ${\mathrm{q}}_{1}=-1.6×{10}^{-19}\mathrm{C}$

It is also known the charge of the proton is ${\mathrm{q}}_{2}=+1.6×{10}^{-19}\mathrm{C}$

It is given that the separation between the electron and proton is $\mathrm{r}=1×{10}^{-10}\mathrm{m}$

It is known that the force can be determined as:

$\begin{array}{rcl}\left|\mathrm{F}\right|& =& \left|\frac{1}{4{\mathrm{\pi \epsilon }}_{0}}\frac{{\mathrm{q}}_{1}{\mathrm{q}}_{2}}{{\mathrm{r}}^{2}}\right|\\ & =& 9×{10}^{9}×\frac{{\left(1.6×{10}^{-19}\right)}^{2}}{{\left(1×{10}^{-10}\right)}^{2}}\\ & =& 2.304×{10}^{-8}\mathrm{N}\end{array}$