99.29: Two light wires are huoxyfy-;rak f+d49w zv*e+*u, , vbwwrng vertically. With electrical current in both wires directed upwards* oe+urw yb9vr+4vf yz;fwk w,a- *d,x

  94.29: Four infinitely long wires are arranged as shown in the accompanying figfeuqc, 5omy 95ure’s end-on view. All four wires are perpendicular to the plane of the page and have the same magnitude of current I. The conventional current in the wire in the upper right-hand corneru9 y5e,qc fmo5 is directed into the plane of the page. The other conventional currents are out of the plane of the page. Point P is a distance a from all four wires. What is the total magnetic field at point P?

  03.30: Two parallel wires are carrying different electric cur9g+cb jv bm)r+ r3tee3rents in the same direction as shown in the di +r9bveb3m creg+t)3jagram. How does the magnitude of the force on A from B compare to the force on B from A?

  06.37: For the four identical4id9-csx ipu28 yw)lp current-carrying wires shown (with conventional current coming out of the plane of the page), the wire on the right is labeled P. What i cwuy i-x4s8) 9pd2plis the direction of the magnetic force on the wire labeled P from the other wires?

  05.22: The diagram below shows a straight wire ca5y yyhug233zxrrying current i in a uniform magnetic field. An arrow indicates the magnetic force F3gzy 5yu2hy3x on the wire. Of the following possibilities, the direction of the magnetic field must be