99.29: Two light wires are hung verti1ux (g/tmb;6 g p 6u.uc:esttg.ens *tcm g*0pcally. With electrical current in both wires gcumep1t/ .e t* *0u 6ust(cgpt.m :sb g;gn6xdirected upwards

  94.29: Four infinitely long wires are arrangej 0 w1an*qu z4.7sufhqd 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 tq aqj14 .sw*hnu0zuf7 he 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 field at point P?

  03.30: Two parallel wires are xpm6siy2 jw34 carrying different electric currents in the same direction as shown in the diagram. How does the magnitude 63ywpxsjm2i4 of the force on A from B compare to the force on B from A?

  06.37: For the four identical current-carry+iv9 c20ghnk(/cka0dt3 m fdh 8ce6tding wires shown (with conventional current coming out of the plane of thc/h0 gkitt ( d0+cfadkem2836d nchv 9e page), the wire 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 unife(p7g5h:aye1 uh5 .dffv ;cnfc1jh5 yorm magnetic field. An acnfgahh5e5dvp:f 1 jyh1; eyc5uf .(7rrow indicates the magnetic force F on the wire. Of the following possibilities, the direction of the magnetic field must be