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

Options

A. C
B. D
C. A
D. B

Answer

A

Explanation

(a) `rarr M_(1)= 2 sqrtM`
(b) `rarr M_(1)^(2)= 0`
(c ) `rarr M_(3)= sqrt(M_(1) + M_(2) + 2M_(1) M_(2) cos 30^(@))`
`= M sqrt(2 + sqrt3)`
(d) `rarr M_(4)= M sqrt3`