99.29: Two light wires are hung vertically. With electrical current in bo:*zdxgxq ,w* kth wires direct* k,qzdxgx: w*ed upwards

  94.29: Four infinitely long wires are 95 i+qdal(mrwarranged as shown in the accompanying figure’s end-on view. All four wires are perpen li+9w5rmdaq( dicular 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 different electric currents in the samesuh dta p(+,y fm+:yh8 direction as shown in the d:(fthpsmyu+ a +yhd8,iagram. 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 b8gj:5 x1pc aucurrent-carrying wires shown (with conventional current coming out of the plane of the page), the wire on the right is labeled P.b u8c5ga1jx: 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 cacv 4b:+z uqow7e5j8g)p;pb el rrying current i in a uniform magnetic fiez)e:j v8 qep gp+7c;4lb5buw old. An arrow indicates the magnetic force F on the wire. Of the following possibilities, the direction of the magnetic field must be