Magnetism Question 71
Question: Two bar magnets with magnetic moments 2 M and M are fastened together at right angles to each other at their centres to form a crossed system, which can rotate freely about a vertical axis through the centre. The crossed system sets in earth’s magnetic field with magnet having magnetic moment 2M making and angle q with the magnetic meridian such that
[AFMC 1999]
Options:
A) $ \theta ={{\tan }^{-1}}( \frac{1}{\sqrt{3}} ) $
B) $ \theta ={{\tan }^{-1}}( \sqrt{3} ) $
C) $ \theta ={{\tan }^{-1}}( \frac{1}{2} ) $
D) $ \theta ={{\tan }^{-1}}( \frac{3}{4} ) $
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Answer:
Correct Answer: C
Solution:
$ \Rightarrow \tan \theta =\frac{M}{2M}=\frac{1}{2}\Rightarrow \theta ={{\tan }^{-1}}=\frac{1}{2} $
BETA
