An electron is moving around the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force between the two is (K = 1/(4πε₀)):
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An electron is moving around the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force between the two is (K = 1/(4πε₀)):

G1 Physics · Accepted Answer

Step 1: Coulomb attraction has magnitude F = Ke²/r². Step 2: Taking r̂ radially outwards from the nucleus, force on electron points inward, opposite to r̂. Step 3: Vector F⃗ = −(Ke²/r²)r̂.