Question

The magnetic induction at a point $1cm$ away from a straight, long current carrying conductor is found to be $1\times {10}^{-5}Wb/m^2$. The current that is passing through the conductor is

• A. $1A$
• B. $0.5A$
• C. $1.5A$
• D. $2A$

Answer 1

The correct option is B $0.5A$

$B=\frac{{\mu }_{0}i}{2\pi r}$
$1\times {10}^{-5}=\frac{2\times {10}^{-7}\times i}{{10}^{-2}}$
$i=0\cdot 5A$