When is the torque on a current carrying loop with magnetic moment u in a unifor

Question

When is the torque on a current carrying loop with magnetic moment u in a uniform magnetic field B equal to zero? A) when u and B are perpendicular B) when u and B are parallel or antiparallel C) when the angle between u and B is 30 degrees D) when the angle between u and B is 45 degrees
I know to answer is B, but I don't know why this is so. What is the theory behind this answer? When is the torque on a current carrying loop with magnetic moment u in a uniform magnetic field B equal to zero? A) when u and B are perpendicular B) when u and B are parallel or antiparallel C) when the angle between u and B is 30 degrees D) when the angle between u and B is 45 degrees
I know to answer is B, but I don't know why this is so. What is the theory behind this answer? A) when u and B are perpendicular B) when u and B are parallel or antiparallel C) when the angle between u and B is 30 degrees D) when the angle between u and B is 45 degrees
I know to answer is B, but I don't know why this is so. What is the theory behind this answer?

Explanation / Answer

here,

the torque exerted on a current carrying coil placed in a magnetic field can be given by the vector product of the magnetic moment and the magnetic field.

so the Torue = m X B = m * B * sin(theta)

theta is the angle between m and B

for sin(theta) = 0

theta may be 0 degree or 180 degree

so, correct option is B) when u and B are parallel or antiparallel

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