Two bar magnets of the same mass, length and breadth but magnetic moments M and 2M respectively, when placed in same position, time period is 3 sec. What will be the time period when they are placed in different position [NCERT 1977; DPMT 1999]

• A.            \[\sqrt{3}\sec \]                 
• B.            \[3\sqrt{3}\sec \]
• C.            \[3\sec \]                               
• D.            \[6\sec \]