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A straight conductor carries a current a...

A straight conductor carries a current along the z-axis. Consider the points A (a, 0, 0), B(0, -a, 0), C(-a, 0, 0) and D(a, a, 0):

A

all four points have magnetic fields of the same magnitude.

B

all four points have magnetic fields in different directions.

C

the magnetic fields at A and C are in opposite directions.

D

the magnetic fields at A and B are mutually perpendicular.

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The correct Answer is:
A, B, C, D
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