# Magnetic field with loop

annamal
Ok, so you found the net force is zero. But we don't care about the net force, we care about the net torque. So find the torque on an element and then integrate.
What do you mean by that
##\vec r \times \vec F = (rcos\theta, rsin\theta, 0) \times (0, 0, 0)## = 0?