Question

A very long conductor carries a current of $ 1 A $ . The magnetic field at a point whose distance is $ 0.1\, m $ from one end of the conductor is (in $ T $ )

• A. $ 10^{-7} $
• B. $ 2 \times 10^{-6} $
• C. $ 10^{-3} $
• D. None of the above

Answer 1

Answer: (D)

$I=1A, x=0.1\,m$
Magnetic field at point $P$,
$B=\frac{\mu_{0} I}{4\pi x}=\frac{1}{0.1}\times10^{-7}$
$=10^{-6}\,T$