straight wire carries a current moving down the page. What is the direction of t

Question

straight wire carries a current moving down the page. What is the direction of the magnetic fiel at point P due to the current? 3 % (A) right, (B) left, (C) upward, (D) downward, (E) into the page, (F) out of the page, (G) Clockwise, (H) Counter-clockwise ) A long, straight wire carries a current pointing into the page. What is the direction of the magnetic fie at point P due to the current? 3 % (A) right, (B) left, (C) upward (D) downward, (E) into the page, (F) out of the page, (G) Clockwise, (H) Counter-clockwise.

Explanation / Answer

The direction of the magnetic field is given by the right-hand thumb rule which states that holding the current carrying wire in the right hand while pointing the thumb in the direction of the current and curling the fingers around the wire, the direction of the magnetic field at any point is given by the direction of the tangent to the fingers at that point.

2)

So, for the cuurent moving down the page, the direction of the magnetic field at P is (E) into the page.

3)

For current going into the page, the direction of magnetic field at P is (C) upward.

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