Magnetism and Matter - Result Question 1

1. Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment $\overrightarrow{{}m}$. Which configuration has highest net magnetic dipole moment?

[2014] A.

C.

B.

D.

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Solution:

  1. (c) Net magnetic dipole moment $=2 Mcos \frac{\theta}{2}$ As value of $\cos \frac{\theta}{2}$ is maximum in case (c) hence net magnetic dipole moment is maximum for option (c).