Q. The field due to a long straight wire carrying a current $I$ is proportional to
A) $I$
B) $I^{3}$
C) $\sqrt{I}$
D) 1/$I$
Explanation
(a) $B = \frac{\mu_{0}}{4\pi}.\frac{2i}{r} \Rightarrow B \propto i$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.