A circular wire loop of mass M and radius R carries a current I . It hangs from a hinge that allows it to swing in the direction perpendicular to the plane of the loop. A uniform magnetic field B exists everywhere in space pointing upwards. What angle theta does the plane of the loop make with the vertical when it is in static equilibrium?

Question

a)theta=pi/2
b)theta=arcsin(BIRpi/(Mg))
c)theta=arcsin(Mg/BIRpi)
d)theta=arctan(BIRpi/Mg)
e)theta=arcsin(Mg/BIRpi)

Answer 1

a)theta=pi/2