A. Explain the formation of Cooper pair in a superconductor. How does theelectron-electron interaction via lattice deformation result insuperconductivity?B. A superconducting lead sample has a critical temperature (Tc) of 7.26 K at zeromagnetic field and a critical field of 8 x 105 Tesla at 0 K. Calculate the criticalmagnetic field at 5 K.C. In London's phenomenological theory of superconductors, what is the Londonpenetration depth (2.)?D. Mercury has a critical temperature (Tc) of 4.12 K and its London penetrationdepth (2) at 0 Kis 519 x 10-10 m. Estimate the penetration depth at 3.50 K.

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[Condensed Matter Physics]