Question: The drawing shows four situations in which two very long wires are carrying the same current, although the directions of the currents may be different.

The drawing shows four situations in which two very long wires are carrying the same current, although the directions of the currents may be different. The point P in the drawings is equidistant from each wire. Which one (or more) of these situations gives rise to a zero net magnetic field at P?
(a) 2 and 4
(b) Only 1
(c) Only 2
(d) 2 and 3
(e) 3 and 4

P. P. P. P. 3

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