Show that the moment of the force on a circular conductor, area, A, carrying a current, i, and whose plane is inclined at an angle, , to the magnetic flux density, B, is M = BAi cos . What primary and...

Show that the moment of the force on a circular conductor, area, A, carrying a current, i, and whose plane is inclined at an angle,
, to the magnetic flux density, B, is M = BAi cos.

What primary and secondary turns are required for a 240V/1kV, 50 Hz transformer if its core crosssectional area is 0.008 m2 and its maximum flux density is 1.2 T?