Please explain the lines in the brack ets in detail in the

Last updated: 6/8/2023

Please explain the lines in the brack ets in detail in the picture attached How is the principle of relativity relat ed to faradays law even if the charges are stationary land the q vx B term of the Lorentz force is not operativel an emf is nevertheless induced in the presence of a time varying magnetic field Thus moving charges in static field and static charges in a time varying field seem to be symmetric situation for Faraday s law This gives a tantalising hint on the relevance of the principle of relativity for Faraday s law The motion of a copper plate is damped when it is allowed to oscillate between the magnetic pole pieces How is the damping force produced by the eddy currents