99.29: Two light wires are hung vfmi2jh(+n yo, ertically. With electrical current in both wires direc(,n+jm fh2oyited upwards

  94.29: Four infinitely long w2 w2rd)cs*l;lcy 1h *hu:nf mvpjn7y9 ires are arranged as shown in the accompanying figure’s end-on view. All four wires are perpendicular to the plane of the page and have th *j1dp*hnsmfw u;7c29ryhy :2l)l vnce 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 different electric currents in the ;iopmrn((o ps17l e8dsame direction as shown in the diagram. How doepnsd lr(po( oi;78m1 es 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 (withy;qvc* 5p/qj c 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 t5qpvy/j *c cq;he other wires?

  05.22: The diagram b 5 y qew0ld7*y1gyt1tdelow shows a straight wire carrying current i in a uniform magnetic field. An arrow indicates the magnetic forct 1t5y0egdl*7qw1d yye F on the wire. Of the following possibilities, the direction of the magnetic field must be