Question

Magnetic field at a distance 2.4 cm from
a long straight wire is 16 ul. What must
be current through the wire?
​

Answer 1

Given that,

The magnetic field at a distance 2.4 cm from a long straight wire is 16 μT.    

To find,

Current through the wire.  

Solution,

The formula used to find the magnetic field due to a long straight wire is given by :

$B=\dfrac{\mu_o I}{2\pi r}$

I is current

$I=\dfrac{2\pi rB}{\mu_o}\\\\I=\dfrac{2\pi \times 2.4\times 10^{-2}\times 16\times 10^{-6}}{4\pi \times 10^{-7}}\\\\I=1.92\ A$

So, the current of 1.92 A is flowing through the wire. Hence, this is the required solution.