Q. $1A$ current flows through an infinitely long straight wire. The magnetic field produced at a point $1\ metre$ away from it is
A) $2 \times 10^{- 3}tesla$
B) $\frac{2}{10}tesla$
C) $2 \times 10^{- 7}tesla$
D) $2\pi \times 10^{- 6}tesla$
Explanation
(c) $B = 10^{- 7} \times \frac{2i}{r} = 10^{- 7} \times \frac{2 \times 1}{1} = 2 \times 10^{- 7}T$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.