The figure below shows a long straight wire just touching a circular loop carrying a current I1 = 3.38 A in the clockwise direction. Both lie in the same plane.
(a) What direction must the current I2 in the straight wire have in order to create a magnetic field at the center of the loop in the direction opposite to that created by the loop?
(b) What current must the long straight wire carry in order have zero net magnetic field strength at the center of the loop?
