In 1921, Kapitsa was sent to England - he worked at the Cavendish Laboratory at Cambridge University, where he became director of the laboratory at Mond Royal Society, led by E. Rutherford. His work 20s. XX century. devoted to nuclear physics, physics and technology of strong magnetic fields, physics and technology of low-temperature
He established the law of linear increase in the electrical resistance of a number of metals, depending on the intensity of the magnetic field (the Kapitza law).