Question

At a point on the right bisector of a magnetic dipole the magnetic

• A. potential varies as $\frac{1}{r^2}$
• B. potential is zero at all points on the right bisector
• C. field varies as $r^2$
• D. field is perpendicular to the axis of dipole

Answer 1

Answer: (A)

potential varies as $\frac{1}{r^2}$

Answer 2

The magnetic potential due to a magnetic dipole at distance $r$ is given by $V=\frac{\mu_0}{4\pi} \frac{M\, cos\, \theta}{r^2}$ On the right bisector (ie, on axial line), $\theta = 0^\circ$ $\therefore =\frac{\mu_0}{4\pi}.\frac{M}{r^2}$ or $V??frac{1}{r^2}$