a
Magnetic field due to moving charge
$B =\frac{\mu_0}{4 \pi} \frac{ q \sin \theta}{ r ^2}$
$B =\frac{\mu_0}{4 \pi} \frac{ ev \sin (\pi / 2)}{ r ^2}$
$B =\frac{10^{-7} \times 1.6 \times 10^{-19} \times 6.76 \times 10^6}{0.52 \times 0.52 \times 10^{-20}}$
$B =40\,T$