Question

A wire 5 m above the ground carries a current of 50 A
from south to north. Find the direction and magnitude of
the magnetic field on ground directly below the cable.​

Answer 1

Given that,

Height = 5 m

Current = 50 A

We need to calculate the magnetic field

Using formula of magnetic field

$B = \dfrac{\mu I}{2\pi d}$

Where, I = current

d = distance

Put the value into the formula

$B=\dfrac{4\pi\times10^{-7}\times50}{2\pi\times5}$

$B=0.000002\ T$

$B=2.0\times10^{-6}\ T$

Hence, The magnetic field is $2.0\times10^{-6}\ T$ and the direction of magnetic field is east ward.

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Topic : magnetic field

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