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AMU Medical AMU Solved Paper-2012

  • question_answer
    A planar coil having 12 turns carries 15 A current. The coil is oriented with respect to the uniform magnetic field B = 0.2i T such that its directed area is A = 0.04 i \[{{m}^{2}}\]. The potential energy of the coil in the given orientation is

    A)  0                                            

    B)  + 0.72 J

    C)                  +1.44 J                

    D)                  -1.44J

    Correct Answer: D

    Solution :

                     Given   n = 12 turns                 i = 15 A                 B = 0.2 i                 \[A=-0.04\,i\,{{m}^{2}}\] Potential energy, V = NIAB                 \[=12\times 15\times (-0.04)\times 0.02\]                 \[=-1.44\,J\]


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