Question

At what distance from a long straight wire carrying a current of 12a will the magnetic field be equal to 3×10-5 tesla

Answer 1

this is the answer and good question

Answer 2

Answer:

Distance, r = 0.08 m

Explanation:

Current flowing through a long straight wire, I = 12 A

Magnetic field, $B=3\times 10^{-5}\ Tesla$

We have to find the distance from a long straight wire that is carrying a current of 12 A.

Magnetic field for a long straight wire is given by :

$B=\dfrac{\mu_0I}{2\pi r}$

$r=\dfrac{\mu_0I}{2\pi B}$

$r=\dfrac{4\pi\times 10^{-7}\times 12\ A}{2\pi\times 3\times 10^{-5}}$

r = 0.08 m

Hence, at 0.08 m from a long straight wire carrying a current of 12 A.