Figure 22.59 shows a long straight wire just touching a loop carrying a current I₁. Both lie in the same plane.

(a) What direction must the current I₂ in the straight wire have to create a field at the center of the loop in the direction opposite to that created by the loop?

(b) What is the ratio of I₁/I₂ that gives zero field strength at the center of the loop?

(c) What is the direction of the field directly above the loop under this circumstance?

Transcribed Image Text:

R I₁ 1₂