1. Electron (-) has a charge of 1.6 x 10-19 C. Proton (+) has a charge of 1.6 x 10-19
C. In a hydrogen atom the distance between a proton and an electron is
5.3 x 10-12 meter.
a) Calculate the force acting between the proton and the electron. Show your
work. Remember to include a correct force unit in your final answer.

, attractive

Explanation:

The magnitude of the electrostatic force between two charges is given by Coulomb's law:

where:

is the Coulomb's constant

are the two charges

r is the separation between the two charges

And the force is:

- Repulsive if the two charges have same sign

- Attractive if the two charges have opposite signs

In this problem:

is the magnitude of the charge of the electron

is the magnitude of the charge of the proton

is the separation between the two particles

So the magnitude of the force is

And since the two charges have opposite signs, the force is attractive.

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