99.29: Two light wires are hung verticalz,j 3ny pc)/08 u6kectm7y evkly. With electrical current in both wires directed upwa,6cct 0k p/)3z8ey uvyn jmke7rds

  94.29: Four infinitely long wires are unhklt44q xuq, a ..8sarranged 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 direh4t8laukx. qu 4s,qn.cted 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 carryip:xwl6fdnt,/ ft:kb;/w pzv+ng different electric currents in the same direction as shown in the diagram. How does the magnitude of the force on A w:6f x:tw /zkn+dt,bv/pp;l ffrom B compare to the force on B from A?

  06.37: For the four identical current-carrying wires shown (with wn co4rwd.+2c kisj56qf6s2;zsa b8rconventional current coming out of the plane ojw5c . irorfsdskan4 62 8q6sw b2+c;zf 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 other wires?

  05.22: The diagram below shows a straight wire carrylf56eq7 r5 9esrx-tbping current i in a uniform magnetic field. An arrow indicates the magnetic force lext5rp fq9 e7s6-rb5 F on the wire. Of the following possibilities, the direction of the magnetic field must be