Question

The picture below shows a cross-sectional view through three long straight current-carrying wires, which are each carrying current perpendicular to the page (or the screen). In this problem, use these values:

the distance: a = 60.0 cm;

the current: I = 3.50 amps.

(a) Calculate the net force per unit length acting on the wire that carries a current of 3I out of the page, at  x = +2a.

(b) Calculate the net magnetic field at x = +a. Use a plus sign if the field is directed up, and a minus sign if the field is directed down

(c) Calculate the magnitude of the net magnetic field at at a distance of a directly above the wire located at x = 0.

(d) In which region, on the x-axis, is there a point a finite distance from the wires at which the net magnetic field is zero? Select all the correct answers.

- to the left of x = −2a

- in between x = −2a and x = 0

- in between x = 0 and x = +2a

- to the right of x = +2a

(e) Find the distance from x = 0 to the point closest to x = 0 where the net magnetic field is zero.

31 31 -за -a +a +2a +3a

Answer 1