A new static-electromagnetic reciprocity principle is presented, extending ordinary resistive reciprocity to the case of nonzero magnetic fields by requiring the magnetic field to be reversed when the reciprocal measurement is made. The principle is supported by measurements on various types of specimens, including those which exhibit the quantum-Hall effect. A derivation using elementary electromagnetic theory shows that the principle will hold provided only that the specimen is electrically linear (Ohmic), and that the Onsager form for the conductivity tensor applies throughout. The principle has important implications for electrical measurements on semiconductors in applied-magnetic fields.

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Microstructural Composites of polyacetylene/polybutadiene blends were prepared by polymerizing polyacetylene in a matrix of polybutadiene. The polyacetylene in the blends can be doped with iodine to produce electrically conducting composites. Thus a new material is formed which retains many of the electrical properties of doped polyacetylene but whose mechanical properties are different from those of either polyacetylene or polybutadiene.

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