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)

None of the above

Answer 2

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