Question

Q7. Calculate the Coulomb force between a proton and an electron separated by 0.8 x 10-15 m.

Answer 1

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Answer 2

Explanation :

Charge of electron, $q_1=-1.6\times 10^{-19}\ C$

Charge of proton, $q_2=+1.6\times 10^{-19}\ C$

Distance between them, $r=0.8\times 10^{-15}\ m$

Coulomb's force is given by :

$F=k\dfrac{q_1q_2}{r^2}$

$F=9\times 10^9\times \dfrac{1.6\times 10^{-19}\ C\times 1.6\times 10^{-19}\ C}{(0.8\times 10^{-15}\ m)^2}$

$F=360\ N$

Hence, the force between the proton and electron is 360 N and it is attractive in nature.