Two electrons are separated by a distance of 1Å. What is the coulomb force between them?

Two electrons are separated by a distance of 1Å. What is the coulomb force between them?

Options

(a) 2.3×10⁻⁸ N
(b) 4.6×10⁻⁸ N
(c) 1.5×10⁻⁸ N
(d) None of these

Correct Answer:

2.3×10⁻⁸ N

Explanation:

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  • 1 angstrom = 10^-10 metre.

    Also,electron charge=1.6 X 10^-19

    F=1/4π€.(q1 X q2)/r^2

    thus,

    F=(9X10^9) X (1.6X10^-19)^2/(10^-10 X 10^-10)

    Hence,F = 23.04 X 10^-9

    Implies,F = 2.3 X 10^-8 N

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