A conducting loop carrying a current I is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to

  • Option 1)

    Contract

     

  • Option 2)

    Expand
     

  • Option 3)

    Move towards +ve x -axis
     

  • Option 4)

    Move towards ?ve x-axis

 

Answers (1)
D Divya Saini

As we learnt in 

Force on a current carrying conductor -

\underset{dF}{\rightarrow} =i (\underset{dl}{\rightarrow}\times \underset{B}{\rightarrow})

- wherein

idl=current element 

 Consider small portion of coil. Force acting on this portion is radially outward. Hence the tendency of coil is to expand.


Option 1)

Contract

 

incorrect

Option 2)

Expand
 

correct

Option 3)

Move towards +ve x -axis
 

incorrect

Option 4)

Move towards ?ve x-axis

incorrect

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