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The same downward force is applied to four objects resting on a horizontal surface. Which exerts the greatest pressur…
Four identical measuring cylinders contain liquid. Two contain water of density 1000 kg/m³. Two contain paraffin of d…
A steel ball is released just below the surface of thick oil in a cylinder. During the first few centimetres of trave…
The coil in an electric motor is wound onto a cylinder. Why is the cylinder made of soft iron?
The electromotive force (e.m.f.) induced in a conductor moving at right-angles to a magnetic field does not depend upon
The diagram shows part of an a.c. generator when its coil is in a horizontal position. The graph shows the voltage ou…