Question

Four parallel conductors, carrying equal currents, pass vertically through the four corners of a square $WXYZ$. In two conductors, the current is flowing into the page, and in the other two out of the page. In what directions must the currents flow to produce a resultant magnetic field in the direction shown at $O$, the center of the square ?

	Into the page	Out of the page
a	W and Y	X and Z
b	X and Z	W and Y
c	W and Z	X and Y
d	W and X	Y and Z

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (D)

To get magnetic field in resultant direction, current in $X$ should be in and that in $Z$ should be out; current in $W$ should be in and that in $Y$ should be out.