Question

# An equilateral triangular loop is kept near to a current carrying long wire as shown in figure. Under the action of magnetic force alone, the loop

A
must move along positive or negative X-axis
B
must move in XY plane and not along X- of Y- axis
C
does not move
D
moves but which way we cannot predict
Solution
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#### The magnetic field would be into the plane of the triangle, with magnitude decreasing as gone farther from the the current carrying wire. From symmetry, the magnitudes of →F1 and →F2 would be same. Thus they would not have any vertical component. Thus, the triangle would move only in the X-direction.

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