Q. A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It
A) Will become rigid showing no movement
B) Will stay in any position
C) Will stay in north-south direction only
D) Will stay in east-west direction only
Explanation
(b) Since magnetic field is in vertical direction and needle is free to rotate in horizontal plane only so magnetic force can not rotate the needle in horizontal plane so needle can stay in any position
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.