Walker, Halliday & Resnick — Electric Potential: Problem 66

66 Figure 24-50a shows an electron moving along an electric dipole axis toward the negative side of the dipole. The dipole is fixed in place. The electron was initially very far from the dipole, with kinetic energy 100 eV. Figure 24-50b gives the kinetic energy K of the electron versus its distance r from the dipole center. The scale of the horizontal axis is set by \( r_s = 0.20 \text{ m} \). What is the magnitude of the dipole moment?