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 \[M=\sqrt{{{M}^{2}}+{{M}^{2}}}\] \[=\sqrt{2\,{{M}^{2}}}\] \[=\sqrt{2}\,M\]