In the Figure above, QR is a vertical conductor and the current I flows from R to Q, P is a point on the horizontal plane and is to the south of the wire. The direction of the magnetic field at P due to the current is
Upward
North
South
West
East
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The direction of the magnetic field at point P due to the current flowing from R to Q is West. This is determined by the right-hand rule, where if the thumb points in the direction of the current, the fingers curl in the direction of the magnetic field. Since P is south of the wire, the magnetic field at P points towards the West.
The direction of the magnetic field at point P (south of a vertical wire with downward current \(R\rightarrow Q\)) is D. West. Using the right-hand grip rule, with the thumb pointing downward (direction of current \(I\)), the fingers curl in a clockwise direction when viewed from above, pointing West at the southern position. Detailed Explanation: Current Direction: \(R\) (top) to \(Q\) (bottom) means current is flowing downward.Point P Location: South of the wire.Right-Hand Grip Rule: Point your thumb downward. Your fingers will curl around the wire in a clockwise direction (looking down from above).Resulting Field: At the Southern point, the clockwise motion moves from East to West.
Using Maxwell's cork screw rule by thumbing up with your right hand, you'll see that the magnetic field will move point P from south to East.[NOTE : East is at the right while West is at the left]
