magnetic field

[vycka1990]

I have problems solweing this task.
In magnetic field with induction 0.25 is a flat coil wich has N=75 whrols with a radius of 25cm. Angle between Coil‘s flat and magnetic force lines is 60 degrees. How much torque afects coil in a magnetic field, while there flows 8A of curent? What work must be carried out, removing the coil from the magnetic field?
I read all the book trying to find formulas that i need to use, but i cant understand what formulas i need. very very please vrite those formulas that i need to use to solve this task (and sory for my bat english).

[Patrick]

A magnetic field is a field of force produced by a magnetic object or particle, or by a changing electrical field[1] and is detected by the force it exerts on other magnetic materials and moving electric charges. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field. The term magnetic field is used for two different vector fields, denoted B and H.[nb 3] There are many alternative names for both (see sidebar). To avoid confusion, this article uses B-field and H-field for these fields, and uses magnetic field where either or both fields apply. Permanent magnets are objects that produce their own persistent magnetic fields. All permanent magnets have both a north and a south pole. They are made of ferromagnetic materials such as iron and nickel that have been magnetized. For more details about magnets see magnetization below and the article ferromagnetic. Like magnetic poles brought near each other repel while opposite poles attract. This is a specific example of a general rule that magnets are attracted (or repulsed depending on the orientation of the magnet) into regions of higher magnetic field. For example, a magnetic pole placed near an opposite pole will be drawn into the stronger magnetic field near that pole. This effect depends on the orientation of the magnet relative to the magnetic field of the other; two like poles brought near each other will push each other away into regions of lower magnetic field.