Ok so you want to use the following formula which corresponds to the magnetic force on a wire F = (B)(I)(L) (where L is usually represented by a small l but it looks like I which corresponds to current).
Ok so we need to know what all the letters stand for F of course is the magnetic force. B is the magnetic field strength ( 0.050 T). I is the current (10 A) and L is the length (1.2) of the wire where the magnetic force has an affect. Slot this into your equation and you're done.
F = (0.050)(10)(1.2)
= 0.6 N (Newtons
Hope this helps :).
