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question: Use the following quantities to calculate the magnetic field strength of the horseshoe magnet.

Mass of coil: 20 grams

current in coil: 2.0 amps

length of bottom of coil: 10cm

angle coil makes with vertical: 30 degrees

Hint: Equate magnetic force on bottom of coil to the horizontal componen of the coils weight.

The question also adds that there are at least 3 assuptions made in answering this question.

I've got a diagram

http://i122.photobucket.com/albums/o272/science_f/0000000000000coilandmagnet.jpg

I don't know where to start in the calculating process Can someone please help me with the starting point and i'll try and progress from there...this is the first time I've seen a problem like this