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Lesson 19 (1) An infinitely long wire on the y-axis carries a 20A current in the +y-direction. At the point (1,0,0) where coordinates are in meters, find 1. the direction of the magnetic field 2. the magnitude of the magnetic field (2) How large is the contribution from the part of the wire between the points (0,-1,0) and (0,2,0)? (3) A long straight wire is attached to a circular loop of radius 2.0m as shown. A 15.0A current runs upward along the straight wire. What must be the direction and magnitude of the current in the loop so that the magnetic field is zero at the center of the loop? (4) Find the magnetic field at the center of an equilateral triangle wire frame carrying current I. (5) Two infinitely long wires carry equal currents of 8.0A running anti-parallel to each other. They are both parallel to the z-axis, and are located on the xaxis at x=3.0m and x=0.0m respectively. Find the magnetic field at the following points on the x-y plane: (a) (5,0,0) (b) (1,0,0) (c) (3,1,0) (6) What is the direction of the magnetic field at the point A due to the currents on two infinitely long wires as shown? (7) Two parallel 10cm long wire a distance 0.8mm apart carrying anti-parallel current of the same magnitude I repel each other with a force of 0.4mN. What is the value of I? (8) A rectangular wire frame is placed near an infinitely long wire. Both carry currents. Find 1. 2. 3. 4. the force on ab the force on cd the sum of forces on bc and da the net force on the frame