# Physics

Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 2.26 × 10-11 m. Determine the magnitude of the electron's centripetal acceleration.

Electron mass= 9.11X 10^-31 kg
Electron charge= -1.60x10^-19 C
Proton charge= 1.60x10^-19 C

1. Electrostatic force=centripetal force Fe=9*10^9*4*(1.6*10^-19)^2/(2.26*10^-11)^2=1.804*10^-6N 1.804*10^-6=9.1*10^-31a a=1.983*10^-24m/s^2

posted by Kosy

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