Field near a straight wire: direction and strength

1. A.
   directly above the wire.
2. B.
   directly below the wire.
3. C.
   located in the plane of the paper on the north side of the wire.
4. D.
   located in the plane of the paper on the south side of the wire.

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1. A.
   in the same direction as the current in the wires.
2. B.
   in the vertically upward direction.
3. C.
   zero
4. D.
   in the vertically downward direction.

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1. A.
   Both (A) and (R) are true and (R) is the correct explanation of (A).
2. B.
   Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. C.
   (A) is true, but (R) is false.
4. D.
   (A) is false, but (R) is true.

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