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  • Confused! kindly explain, - Magnetic Effects of Current and Magnetism - NEET

A short bar magnet of magnetic moment 0.4JT^{-1}  is placed in a uniform magnetic field of 0.16T. The magnet is in stable equilibrium when the potential energy is

  • Option 1)

    -0.064J

  • Option 2)

    zero

  • Option 3)

    -0.082J

  • Option 4)

    0.064J

 

Answers (1)

 

Potential energy of current carrying coil -

U=-MBcos heta

U=-underset{M}{ ightarrow}.underset{B}{ ightarrow}

-

 

In stable equilibrium \theta =0\\ U=-MB\\ =-0.4\times 0.16J=-0.064J

 


Option 1)

-0.064J

This solution is correct 

Option 2)

zero

This solution is incorrect 

Option 3)

-0.082J

This solution is incorrect 

Option 4)

0.064J

This solution is incorrect 

Posted by

subam

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