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 ?

Options

A. a
B. b
C. c
D. d

Answer

C

Explanation

(c)
`M_("net")=sqrt(n^(2)+m^(2)+2mm cos 30^(@))=m sqrt(2+sqrt(3))`
(d)
`M_("net")=sqrt(m^(2)+m^(2)+2mm cos 60^(@))= sqrt(3m)`
is configuration (c) - is least is maximum.