Answer to Question #289839 in Electric Circuits for boshra

Question

At what distance a long, straight wire carrying a current of 3 A can develop a

        magnetic field of 7x10-7 T

Answer 1

Answer

Let this distance is d.

Current through wire I=3A

Magnetic field B=$7\times10^{-7}T$

Then distance is given by

$d=\frac{\mu_0 2 I}{4\pi B}$

Putting all values

$d=\frac{10^{-7}\times 3\times2}{7\times10^{-7}}\\=0.86m$