The work done in turning a magnet of magnetic moment M by an angle of 90o from the meridian is n times the corresponding work done to turn it through an angle of 60o from the meridian, where n is given by :
2
12
14
1
A
12
B
2
C
14
D
1
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Solution
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Work done in 1st case, W1=MB(cos00−cos900)
Work done in 2nd case, W2=MB(cos00−cos600)
W1=2W2
therefore, n=2.
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