The rectangular loop of wire shown in the figure (Figure 1) has a mass of 0.10g

Question

The rectangular loop of wire shown in the figure (Figure 1) has a mass of 0.10g per centimeter of length and is pivoted about side ab on a frictionless axis. The current in the wire is 8.2A in the direction shown.
Find the magnitude of the magnetic field parallel to the y-axis that will cause the loop to swing up until its plane makes an angle of 30.0 degrees with the yz-plane.

http://session.masteringphysics.com/problemAsset/1261736/2/YF-27-75.jpg

Explanation / Answer

formulaes torque=IBAsin(phi) I=current B= Magnitude 30 degrees A= area (8cm*6cm)=48cm^2 => .48m^2 The attempt at a solution using the right hand rule i know the direction is in the + y-direction. with the equation i have, i don't how to fit the mass of the loop. so then i was trying to find the force but lack enough information from the problem.

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