Physics - Wave on String Question with Solution | TestHub

The magnetic potential due to a magnetic dipole at distance $r$ is $$V=\frac{{\mu }_0}{4\pi }\frac{M\cos \theta }{r^2}$$ On the right bisector (ie, on axial line), $\theta =0^{\circ }$ $$V=\frac{{\mu }_0}{4\pi }\frac{M}{r^2}\text{ or }V\propto \frac{1}{r^2}$$