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# A constant current flows along the length of a thin-walled, infinitely long, cylindrical pipe. Then magnetic field

$\begin {array} {1 1} (a)\;Inside\: the \: pipe\; is \: non-zero\: constant & \quad (b)\;Inside\: the \: pipe\; is \: not\: constant \\ (c)\;Is \: zero\: only\: on \: the \: axis \: of \: the \: pipe & \quad (d)\;Inside \: the \: pipe\: is\: zero \end {array}$

On constructing an Ampere’s loop anywhere inside, one observes that $i_p$ is zero
Ans : (d)