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The figure at the left below shows a cross section of four long parallel wires (labeled A through D ) taken in a plane perpendicular to the wires. One or more of the wires may be carrying a current. If a wire carries a current it is in the direction indicated and has magnitude I₀.

For each of the four vector quantities (i) through (iv) give the direction of the quantity. To indicate the direction, use one of the letters associated with a directional arrow on the "compass" figure at the right below. If the magnitude of the quantity is zero, write "0". If it is non-zero, but in none of the indicated directions, write "Other".

1. Only wires B and D are carrying current. The direction of the force on wire D is ____.
2. Only wires B and D are carrying current. The direction of the force felt by an electron traveling in the C direction (on the compass) is ____.
3. Only wires B and D are carrying current. The direction of the force felt by an electron traveling in the A direction (on the compass) is ____.
4. All four wires are carrying current. The direction of the net force felt by wire A is ____.

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Page last modified November 5, 2002: MG08