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Physics Magnetism,Magnetic Effects Of Current Level: University

Torque on current  coil
A circular coil consists of 5 loops each of diameter 1.0m. The coil is placed in an external magnetic field of 0.5T. When the coil carries a current of 4.0A a torque of magnitude 3.93N * m acts on it. Determine the angle between the normal to the plane of the coil and the direction of the magnetic field.
(a) 0
(b) 30
(c) 45
(d) 60
(e) 90