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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2004

  • question_answer
    A bar magnet of magnetic moment M and length L is cut into two equal parts each of length L/2. The magnetic moment of each part will be

    A)  M                                          

    B)  M/4

    C) \[\sqrt{2M}\]                                    

    D)  M/2

    Correct Answer: D

    Solution :

    Let pole strength of magnet is m. Then, magnetic moment\[M=mL\]       ...(i) On cutting the magnet into two parts each of length L/2 (pole strength will be same). So, new magnetic moment \[M'=m\times \frac{L}{2}\] From Eq. (I) \[M'=\frac{M}{2}\]


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