99.29: Two light wires are hung vertically. With electricaqxxuw,l9ej 1w-4eh cv:zc-v*l current in both wires directed l9v,uv *jcq z-he -cw w14ex:xupwards

  94.29: Four infinitely long wires are arrangdisxp q b/t14yxmon+*g, 9;dced as shown in the accompanying figure’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 corner 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 fielnt;pos,ddx 1m 9*4qcgxiby/+d at point P?

  03.30: Two parallel wires are carrying different electric currents iny9p/2xbg 2)ey;ng8 ov (w0 j8ranvbhc the same direction as shown in the diagram. How does the magnitude of the force on A from B compare to the forgb2egho/vny0(82r)yxv;cb8n wa 9 p j ce on B from A?

  06.37: For the four identical current-carryi/j at7l*rjfl )ng wires shown (with conventional current coming out of the plane of the page), the wire t/ 7a)fjrlj*l on the right is labeled P. What is the direction of the magnetic force on the wire labeled P from the other wires?

  05.22: The diagram below shows a straight wire carrying current i in a unifohqkme75*c1b *gpg hi .rm magnetic field. An arrow indicates the magnetic force F on the wire. Of the following possibilities, the direcg* 5p i1cehmqk7g *.hbtion of the magnetic field must be