99.29: Two light wires aru8ni7il; nvdcs+))ine hung vertically. With electrical current in both wires directed upwardc 8ind7i;niv u ))nls+s

  94.29: Four infinite v; v:os,-7s tktwuu3gly long wires are arranged as shown in the accompanying figure’s end-on view. All four wires are perpenk wut-tvgvs;s, 7uo:3dicular 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 field at point P?

  03.30: Two parallel wires are carrying differefes sbpn n *vizp/ hu8;x3.l45nt electric currents in the same direction as shown in the dsvpxz8upi4 hn3.; 5l/*sebf niagram. How does the magnitude of the force on A from B compare to the force on B from A?

  06.37: For the four identical current-carrying wires shown (f tgy0 4k )5qhzm;5ntvak- q6qwith conventional current coming out of the plane of the page), the wire on the right is labeled P. What is the direction of the magnetic force on the wire labeled P from the othekz 5 6q -htngqa4vf tyqm5k0);r wires?

  05.22: The diagram below shows a straight wire carrying curr-*(7zgz) d q:yybxq*:qat qp fqw),r vent i in a uniform magnetic field. An arrow indicates the magnetic force F on the wire. Of the following possibilities, the direction of the magneticw*qq:qf ,xrdy *vt )yq(:- apzzq7g)b field must be