Q. Which of the following is/are the units of strength of magnetic field at a point?
A) $NA\ m^{- 1}$
B) $NA\ m$
C) ${NA}^{- 1}\ m^{- 1}$
D) ${NA}^{- 2}\ m^{- 2}$
Explanation
Magnetic field $B = \frac{F}{qv\sin\theta}$ Hence, $1\ T = \frac{1N}{1C\ \times 1\ {ms}^{- 1}}$ $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = \frac{1\ N}{1\ As\ \times 1\ {ms}^{- 1}}\ \ \ \ (\because 1C = 1\ ampere\ \times 1\ second)$ $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = 1\ {NA}^{- 1}m^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.