Question

Three identical thin bar magnets, each of moment M, are placed along three adjacent sides of a regular hexagon as shown in the figure. The resultant magnetic moment of the system is

• A. (A) M
• B. (B) M√3
• C. (C) M√2
• D. (D) 2M

Answer 1

Answer: (D)

(D) 2M

Answer 2

Explanation:
Resultant of I and II,M1=M2+M2+2M2cos⁡60∘=3MAngle between M1 and M‖ is 90∘Hence, the resultant magnetic moment isMR=3M2+M2+23M2cos⁡90∘=2M