# HW11 - used in particular to reduce self-inductance of...

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1 C:\User\Teaching\505-506\F10\HW11.doc PHY 505 Classical Electrodynamics I Fall 2010 Homework 11 (due Friday Dec. 3) Problem 11.1 (to be graded of 15 points). A small, planar loop made of a thin wire, carrying current I , is located far from a plane surface of a bulk superconductor. Within the ideal-diamagnetic description of superconductivity ( B = 0), find: (i) the energy of the loop-superconductor interaction, (ii) the force and torque acting on the loop, (iii) the distribution of supercurrent on the superconductor’s surface. Problem 11.2 (15 points). The Meissner-Ochsenfeld effect is
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Unformatted text preview: used, in particular, to reduce self-inductance of superconducting wiring. Use the London equation to calculate the inductance (per unit length) of a long, uniform superconducting strip placed close to the surface of a similar superconductor – see Fig. on the right, which shows the structure’s cross-section. Hint : Start from thinking how is the supercurrent distributed along the surfaces of the strip and the bulk superconductor (in electrical engineering, called the ground plane ). L d d w L t ~ I...
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