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NEET2014PhysicsMagnetic Effects of CurrentActual

Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole m → . Which configuration has highest net magnetic dipole moment?

Correct answer

2

Step-by-step solution

a M n e t = m 2 + m 2 + 2 m m cos ⁡ 90 o = 2   m b M n e t = m - m = 0 c M n e t = m 2 + m 2 + 2   m m cos ⁡ 30 o = m 2 + 3 d M n e t = m 2 + m 2 + 2   m m cos ⁡ 60 o = 3   m is configuration C   θ is least so M n e t is maximum.

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