# 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

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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