Question

A current of $\frac{1}{4\pi }$ amp is flowing in a long straight conductor. The line integral of magnetic induction around a closed path enclosing the current carrying conductor is

• A. ${10}^{-7}wb/m$
• B. $4\pi \times {10}^{-7}wb/m$
• C. $16{\pi }^2\times {10}^{-7}wb/m$
• D. $Zero$

Answer 1

The correct option is A ${10}^{-7}wb/m$

$\oint Bdl={\mu }_{0}i=4\pi \times {10}^{-7}\times \frac{1}{4\pi }={10}^{-7}wb/m$