Magnetic moment and torque equations for current loops

[J6204]

Homework Statement

I am beginning my preparations for an upcoming exam and am looking to clarify two different equations

a) Write the equation for the magnetic moment of a current carrying loop

b) Write the equation for torque on a current carrying loop in a magnetic field

Homework Equations

The Attempt at a Solution

a) I am not quite sure about this one,

b) I am pretty sure that this one is the following T=NIABsintheta

looking for some clarification, thanks!

 

[haruspex]

See if http://www.physicspages.com/2013/04/11/magnetic-dipole-moment-of-a-current-loop/ helps.