Two engineering students, John with a weight of 96 kg and Mary with a weight of 48 kg, are 30 m apart. Suppose each has a 0.04% imbalance in the amount of positive and negative charge, one student being positive and the other negative. Estimate the electrostatic force of attraction between them by replacing each student with a sphere of water having the same mass as the student.

Answer :

Answer:

[tex]6.8370869499\times 10^{20}\ N[/tex]

Explanation:

[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}[/tex]

e = Charge of electron = [tex]1.6\times 10^{-19}\ C[/tex]

k = Coulomb constant = [tex]8.99\times 10^{9}\ Nm^2/C^2[/tex]

Z = Atomic number of water = 18

M = Molar mass of water = 0.018 kg/mol

m = Mass of person

The charge is given by

[tex]q=imbalance\times n\times e[/tex]

Total number of protons and electrons in each sphere

[tex]n=\dfrac{mN_AZe}{M}[/tex]

[tex]q=imbalance\times \dfrac{mN_AZe}{M}[/tex]

[tex]q_1=0.0004\times \dfrac{96\times 6.022\times 10^{23}\times 18\times 1.6\times 10^{-19}}{0.018}\\\Rightarrow q_1=3699916.8\ C[/tex]

[tex]q_2=0.0004\times \dfrac{48\times 6.022\times 10^{23}\times 18\times 1.6\times 10^{-19}}{0.018}\\\Rightarrow q_1=1849958.4\ C[/tex]

Electrical force is given by

[tex]F=\dfrac{kq_1q_2}{r^2}\\\Rightarrow F=\dfrac{8.99\times 10^{9}\times 3699916.8\times 1849958.4}{30^2}\\\Rightarrow F=6.8370869499\times 10^{20}\ N[/tex]

The electrostatic force of attraction between them is [tex]6.8370869499\times 10^{20}\ N[/tex]

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