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12th Class Physics Magnetism Question Bank Case Based (MCQs) - Magnetism and Matter

  • question_answer
    A current carrying loop is placed in a uniform magnetic field in four different orientations as shown in figure. Arrange them in the decreasing order of potential energy.                                              

    A) IV, III, II, I                    

    B) I, IV, II, III

    C) IV, II, III, I                    

    D) I, II, III, IV

    Correct Answer: B

    Solution :

    (b) I, IV, II, Ill                          \[U=-MB\,\cos \theta \]                         \[{{U}_{1}}=-MB\,\cos 180{}^\circ =+MB\]                         \[{{U}_{2}}=-MB\,\cos 90{}^\circ =0\]                         \[{{U}_{3}}=-MB\,\cos (Acute\,\,angle)=-ve\]                         \[{{U}_{4}}=-MB\,\cos (Obtuse\,\,angle)=+ve\] Hence. I > IV > II > III.


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