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  • Solve this problem - Magnetic Effects of Current and Magnetism - NEET

Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole momentm . Which configuration has highest net magnetic dipole moment?

(a)     (b) 

(c)     (d) 

 

  • Option 1)

    (a)

  • Option 2)

    (b)

  • Option 3)

    (c)

  • Option 4)

    (d)

 

Answers (1)

best_answer

As we learnt in 

Magnetic moment (M) -

M=NiA

- wherein

N-number of turns in the coil 

i-current throughout the coil 

A-area of the coil 

 

In  configuration (1) =     m_{net}=\sqrt{m^{2}+m^{2}+2mm\ cos\ 90^{o}}\sqrt{m^{2}+m^{2}}=\sqrt{2}m

In configuration (2) =      m_{net}=m-m=0

In configuration (3) =      m_{net}=\sqrt{m^{2}+m^{2}+2m^{2} \ cos\ 30^{o}}

                                                                                m_{net}=\sqrt{2m^{2}+2m^{2}\left(\frac{\sqrt{3}}{2} \right )}

                                                                                m_{net}=m\sqrt{2+\sqrt{3}}

In configuration (4) =     m_{net}=\sqrt{m^{2}+m^{2}+2m^{2} \ cos\ 60^{o}}

                                                                                m_{net}=\sqrt{2m^{2}+2m^{2}\left(\frac{1}{2} \right )}=\sqrt{3}m

 

 


Option 1)

(a)

Incorrect

Option 2)

(b)

Incorrect

Option 3)

(c)

Correct

Option 4)

(d)

Incorrect

Posted by

divya.saini

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