Magnetic fields and torque

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[SOLVED] magnetic fields and torque

so for this question, i have an inclined plane with a coil of wire wrapped longitudinally around a cylinder N turns. the plane of the coil is parallel to the inclined plane with a uniform magnetic field they want me to find the least amount of current necessary to prevent the cylinder from rolling down the plane.

im given mass of the cylinder, magnitude of the magnetic field, length of the L portion of the cylinder, & N number of turns.
im not sure where to start, i have this equation, torque=Ntorque'=NiABsin(phi) where A equals area but im only give the L part of the cylinder.

i need to have this done by tonight if any one can help

feel free to lock this thread, i solved the problem
 
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