If a flat loop of wire carrying a uniform current feels a net force due to a mag

Question

If a flat loop of wire carrying a uniform current feels a net force due to a magnetic field, which of teh following must be true?
a) the magnetic field is perpendicular to the plane of the loop (i.e. parallel to the dipole moment)
b) the magnetic field is in the plane of the loop (i.e. perpendicular to the dipole moment)
c) the magnetic field is constant over the loop
d) the magnetic field is not constant over the loop
e) None of the above conditions are really necessary
f) it is impossible for a loop to feel a net force, no matter what

Please choice one of the above and justify your answer.

Explanation / Answer

here,

Current Carrying in magnatic field will feel force perpendicular to field,
from Ampere's Law,

Force = Current * Length * Magnatic field * SinA

Where, SinA is the angle Between the Current and Field.

Force will be max whene A = 90, Sin90 = 1
F = I*L*B

so option B is correct

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