Q. A vertical straight conductor carries a current vertically upwards. A point $P$ lies to the east of it at a small distance and another point $Q$ lies to the west at the same distance. The magnetic field at $P$ is
A) Greater than at $Q$
B) Same as at $Q$
C) Less than at $Q$
D) Greater or less than at $Q$ depending upon the strength of the current
Explanation
(b) If distance is same, field will be same $\left\lbrack \because B = \frac{\mu_{0}}{4\pi} \bullet \frac{2i}{r} \right\rbrack$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.