Q. Two thin metallic strips, carrying current in the direction shown, cross each other perpendicularly without touching but being close to each other, as shown in the figure. The regions which contain some points of zero magnetic induction are
A) I and II
B) I and III
C) I and IV
D) II and III
Explanation
(c) Magnetic field due to both currents at each point online $CD$ being equal and opposite cancel while at each point on line $AB$ they are added up.
[image:4_image120.emf]
Hence, magnetic induction in region I and IV will be zero.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.