A flux quantum (fluxoid) is approximately equal to
2\times 10^(-7)
gauss
-cm^(2)
. A type II superconductor is placed in a small magnetic field, which is then slowly increased till the field starts penetrating the superconductor. The strength of the field at this point is
((2)/(\pi ))\times 10^(6)
gauss. The penetration depth of this superconductor is: