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The paper deals with the issue of induced EMF localization in a Faraday’s unipolar generator which is a revolving magnetic disk with its center and periphery connected by a conductor. Attention has also been given to the linear DC generator consisting of a long magnet and a conductor. Functioning as a closed loop, this conductor moves within the magnetic field of the magnet, the ends sliding on its surfaces. It is shown that in a linear unipolar generator the EMF is induced in a conductor irrespective of a reference frame chosen. Reasons are given in favour of the fact that when a magnetic disk is revolving, the EMF is induced in a stationary conductor of a unipolar generator.

The paper deals with the Terrell-Penrose effect, the component parts of which are the turn of the moving sphere and independence of the form of the sphere, as recorded by a camera, from the speed of motion of the sphere. The present work shows that the independence of the form of the moving sphere from the speed as well as its turn in the photograph are due to the discrepancy between the purpose of the photograph and the choice of the angle of photographing. In examining the Terrell-Penrose effect in this paper preference is given to a reference frame, where the sphere is at rest, whereas the camera (camera obscura) is in motion. With this choice of the reference frame the mentioned optical effects may be accounted for by aberration of light (reflected from the quiescent sphere), which has formed the image on the photoreceptor of the moving camera. In the case of semitransparency of the sphere and the presence of markers at the points of the sphere, which lie on the line of its motion, the Lorentz contraction of the moving sphere would also be revealed by way of photography.