Field and Wave Electromagnetics 2nd Edition by David Cheng

Exercise 7

Assuming that the circular loop in Problem is rotated about its horizontal axis by an angle , find the torque exerted on the circular loop.
Problem:
Refer to Problem and Figure. Find the force on the circular loop that is exerted by the magnetic field due to an upward current I 1 in the long straight wire. The circular loop carries a current 1 2 in the counter clockwise direction.
Problem:
Determine the mutual inductance between a very long, straight wire and a conducting circular loop, as shown in Figure.
Figure: A long, straight wire and a conducting circular loop