Magnetics 4 Question 7

8. A current carrying loop is placed in a uniform magnetic field in four different orientations, I, II, III and IV. Arrange them in the decreasing order of potential energy.

(2003, 2M)

(III)

(IV)

(a) I > III > II > IV

(b) I > II > III > IV

(c) I > IV > II > III

(d) III > IV > I > II

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Answer:

Correct Answer: 8. (c)

Solution:

  1. U=MB=MBcosθ

Here, M= magnetic moment of the loop θ= angle between M and B

U is maximum when θ=180 and minimum when θ=0. So, as θ decreases from 180 to 0, its PE also decreases.



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