Magnetism Question 164
Question: A magnet of magnetic moment 20 C.G.S. units is freely suspended in a uniform magnetic field of intensity 0.3 C.G.S. units. The amount of work done in deflecting it by an angle of 30o in C.G.S. units is
[MP PET 1991]
Options:
A) 6
B) $ 3\sqrt{3} $
C) $ 3(2-\sqrt{3)} $
D) $ 3 $
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Answer:
Correct Answer: C
Solution:
Work done $ W=MB _{H}( 1-\cos \theta ) $
$ =20\times 0.3( 1-\cos 30{}^\circ )=6( 1-\frac{\sqrt{3}}{2} )=3( 2-\sqrt{3} ) $
BETA
