Magnetic field — UPSC Physics Optional CSE 2013 Paper II

A perfect conductor and a superconductor with T_c \sim 10\ \mathrm{K} are subjected to the following conditions:

(i) cooled under applied magnetic field to 4\ \mathrm{K}

(ii) cooled to 4\ \mathrm{K} and then magnetic field is applied with schematic diagrams, explain path of magnetic field lines in all these situations.