When the downward current flows in a straight…north of the wire is

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• A. Upward
• B. North
• C. South
• D. West

D

DETAILS…

From the sketch above, it is obvious that if the current flows downward as shown by the arrow, according to Maxwell’s right-hand corkscrew rule, the direction of the magnetic field will be clockwise when viewed from the top, and perpendicular to the current direction as shown above.

Now, if we measure the direction of this field with respect to the north, at a point it will be pointing eastward, and at another point it will be pointing westward.

Now for the right answer to the above question:

1. Option A is incorrect. Upward and north mean the same thing.
2. Option B is incorrect. north and upward mean the same thing.
3. C is incorrect. the direction of the magnetic field cannot be same with that of the current.
4. D is the correct answer.
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