| Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment m. Which configuration has highest net magnetic dipole moment? [NEET 2014] |
(i)  (ii)  (ii)  (iv)  |
A) (i)
B) (ii)
C) (iii)
D) (iv)
Correct Answer: C
Solution :
| [c] Magnetic moment is from 5 to N |
| \[{{m}_{net}}=\sqrt{{{m}^{2}}+{{m}^{2}}+2{{m}^{2}}\cos \theta }\] |
| \[{{m}_{net}}\] will be maximum if \[\cos \,\theta \] is maximum. |
| \[\cos \theta \] will be maximum when q will be minimum. So, at \[\theta ={{30}^{o}}\,{{m}_{net}}\] will be maximum. |
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