Electricity and Magnetism

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Presentation transcript:

Electricity and Magnetism Physics 208 Dr. Tatiana Erukhimova Lecture 28

Current carrying wires 1820 Hans Christian Oersted Hans Christian Ørsted

Ampere’s Law The field produced by an infinite wire

Problem 6 An infinitely long, hollow cylindrical wire has inner radius a and outer radius b. A current i is uniformly distributed over its cross-section. Find the magnetic field everywhere.

Biot-Savart Law Infinitesimally small element of a current carrying wire produces an infinitesimally small magnetic field is called permeability of free space (Also called Ampere’s principle)

Problem 2 R 2R