Two long, straight wires, one above the other, are separated by a distance 2a and are parallel to the x-axis. Let the +y-axis be in the plane of the wires in the direction from the lower wire to the upper wire. Each wire carries current I in the +x-direction. What are the magnitude and direction of the net magnetic field of the two wires at a point in the plane of the wires (a) midway between them; (b) at a distance a above the upper wire; (c) at a distance a below the lower wire?

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

A thin metal rod has a mass of .024kg and is connected to two parallel rails. The rod can slide left or right. The distance between the two parallel rails is 0.0256m. The is a magnetic field that is perpendicular to the plane of the parallel rails coming out of the page with a magnitude of 0.0563T. The rails are connected by a thin wire. When a current of 0.00913A through the wires(and rod) what is the magnitude of the force and direction of the moving bar?

Two very long, parallel wires are separated by a distance of 2 m. The top wire carries a current of 16 A flowing to the left. Point x lies between the wires, 0.4 m below the top wire (see figure below).  (a) What is the strength of the magnetic field at point x due to the top wire? For part (a) and (b) you may assume no current is flowing in the bottom wire.  (b) What is the direction of the magnetic field at point x due current flowing in the top wire? (Give your answer in terms of toward the top, bottom, left side, right side, into, or out of the page.)  (c)  What current must flow through the bottom wire to have the net (total) magnetic field be zero at point x? Specify both the magnitude and the direction of the current.

Two wires, parallel to a z axis and a distance 4.60 m apart, carry equal currents 3.61 A in opposite directions, as shown in the figure. A circular cylinder of radius 1.15 m and length 8.27 m has its axis on the z axis, midway between the wires. Use Gauss' law for magnetism to find the net outward magnetic flux through the half of the cylindrical surface above the x axis. (Hint: Find the flux through the portion of the xz plane that lies within the cylinder.)

Three long, parallel conductors each carry a current of I = 2.40 A. The figure below is an end view of the conductors, with each current coming out of the page. Taking a = 1.20 cm, determine the magnitude and direction of the magnetic field at the following points.   (a) point A magnitude  µT direction          (b) point B magnitude  µT direction          (c) point C magnitude  µT direction

Consider a wire segment carrying a constant current of 3.0 A as shown on the attached figure. The arc portion of the segment is a 30◦ portion of a circle, the circle has a radius of 0.60 m. Determine the magnitude and direction of the magnetic field generated by the current at a point P at the center of the circle.

In the figure, two concentric circular loops of wire carrying current in the same direction lie in the same plane. Loop 1 has radius 1.70 cm and carries 4.40 mA. Loop 2 has radius 2.40 cm and carries 5.70 mA. Loop 2 is to be rotated about a diameter while the net magnetic field B set up by the two loops at their common center is measured. Through what angle must loop 2 be rotated so that the magnitude of the net field is 91.0 nT? Number i Units

A point charge Q moves on the x-axis in the positive direction with a speed of 644 m/s. A point P is on the y-axis at 43 mm. The magnetic field produced at point P, as the charge moves through the origin, is equal to -6.24 µT in the +z direction. When the charge is at x = 53 mm, what is the magnitude of the magnetic field at point P (in μ.)? μT