First slide

Ampere's circuital law

Question

lf a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be

Easy

A

only inside the pipe
B

only outside the pipe
C

both inside and outside the pipe
D

neither inside nor outside the pipe

Solution

According to Ampere's law
$\oint \vec{B} . \vec{d l} = μ_{0} I$
only for outside point, path of line integration will enclose the current . Hence, B = 0 inside.

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