Question

A circular conductor of radius 5 cm produce magnetic field of $7\times {10}^{-6}T$ The current flows through the conductor is

• A. 3.0 A
• B. 2.25 A
• C. 4.5 A
• D. 0.56 A

Answer 1

The correct option is D 0.56 A

$\begin{array}{c}\frac{{\mu }_{o}i}{2r}=7\times {10}^{-6}T\\ \frac{4\pi \times {10}^{-7}.i\times 100}{2\times 5}=7\times {10}^{-6}\\ 4\pi \times i=7\\ i=\frac{7}{4\pi }=0.56A\\ Hence,theoptionDisthecorrectanswer.\end{array}$