question_answer

Two magnets each of magnetic moment M are placed so as to form a cross at right angles to each other. The magnetic moment of the system will be :

A)  M              

B)  0.5 M

C)  V2M           

D)  2M

Correct Answer: C

Solution :

A bar magnet having north and south poles at its ends is a magnetic dipole. Net magnetic moment is                 \[M=\sqrt{{{M}^{2}}+{{M}^{2}}}\]                 \[=\sqrt{2\,{{M}^{2}}}\] \[=\sqrt{2}\,M\]