Wire 1 consists of a circular are of 200° and two radial lengths; it carries current i₁ = 0.50 A in the direction indicated. Wire 2, shown in cross section, is long, straight, and perpendicular to the plane of the figure. Its distance from the center of the arc is equal to the radius R =3cm of the arc, and it carries a current i = 0.75A. What is the magnitude of the magnetic field at the center of the arc?

The figure below shows wire 1 in cross-section; the wire is long and straight, carries a current of 3.90 mA out of the page, and is a distance d1 = 2.40 cm from a surface. Wire 2, which is parallel to wire 1 and also long, is at horizontal distance d2 = 4.80 cm from wire 1 and carries a current of 6.80 mA into the page. What is the x component of the magnetic force per unit length on wire 2 due to wire 1? __________N/m (please show units. It really helps me out)

As shown in the figure, two long, straight current-carrying wires (1 and 2) are attached at right angles to a board by wire brackets. The current in wire 1 is 6.87 A in the positive y direction and the current in wire 2 is 5.00 A in the positive x direction. The points A and B are a distance r = 0.200 m from both wires. Determine the magnitude of the net magnetic field at points A and B. _____ Point A _____ Point B

Please explain why. Thank you.