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Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment $\vec m$. Which configuration has highest net magnetic dipole moment?
A
(a)
B
(b)
C
(c)
D
(d)
Detailed Solution
Net magnetic moment $= 2M\cos\frac{\theta}{2}$, where $\theta$ is the angle between the two moments.
It is maximum for the smallest angle, i.e. configuration (c) with $\theta = 30^\circ$.
It is maximum for the smallest angle, i.e. configuration (c) with $\theta = 30^\circ$.