Question

A very long straight wire carries a current 5.2A what is the magnitude of magnetic field at a distance 3.1cm from wire​

Answer 1

Given that,

Current = 5.2 A

Distance = 3.1 cm

We need to calculate the magnitude of magnetic field

Using formula of magnetic field

$B=\dfrac{\mu_{0}I}{2\pi d}$

Where, I = current

d = distance

Put the value into the formula

$B=\dfrac{4\pi\times10^{-7}\times5.2}{2\pi\times3.1\times10^{-2}}$

$B=0.0000335\ T$

$B=3.35\times10^{-5}\ T$

Hence, The magnitude of magnetic field is $3.35\times10^{-5}\ T$