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.
B.
C.
D.

Answer

C

Explanation

`(a) M_(1)=msqrt2 `
`(b) underset(m)overset(m)(hArr) Rightarrow M_(2)=0`
`(c) M_(3)=msqrt((1+cos 30^(@))2)`
`" " msqrt((1+(sqrt3)/(2)))2=msqrt(2+sqrt3)`
`(d) " " M_(4)=2m cos30^(@)=msqrt3`