Question 22: NCERT Solutions for 12th Class Physics: Chapter 2-Electrostatic Potential and Capacitance
Figure shows a charge array known as an electric quadrupole. For a point on the axis of quadrupole, obtain the dependence of potential on r for r/a >> 1, and contrast your results with that due to an electric dipole, and an electric monopole (i.e., a single charge).
Solution:
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NCERT Solutions for 12th Class Physics: Chapter 2-Electrostatic Potential and Capacitance