We investigate the two-dimensional magnetic operator
$H_{c_0,B,\beta} = {(-i\nabla -A)}^{2}-\beta\delta(.-\Gamma),$ where $\Gamma$
is a smooth loop. The vector potential has the form
$A=c_0\bigg(\frac{-y}{{x^2+y^2}}; \frac{x}{{x^2+y^2}} \bigg)+
\frac{B}{2}\bigg(-y; x\bigg) $; $B>0,$ $c_0\in]0;1[$. The asymptotics of
negative eigenvalues of $H_{c_0,B,\beta}$ for $\beta \longrightarrow +\infty$
is found. We also prove that for large enough positive value of $\beta$ the
system exhibits persistent currents.