Question 03: Consider a superconducting material with n = total number of electrons, n, = density of superconducting electrons; js = super current density; me = mass of electrons; . We may have the following relation -m,e j, = mc (a) Show that you can get Meissner's effect from above expression. What is London's parameter you can obtain, using the gauge transformation, in this case. (b) Consider a circular ring of radius = 5 cm in superconducting state. The ring is made up of a Pb wire of thickness = 1 mm. A 100 A current flows in this superconducting ring for 12 months, with no change. The current variation detector could detect changes up to luA. In this superconducting state, determine the experimental upper limit to resistivity for the ring shown in the Figure 2? (10+10) 1mm 5 cm