Question

Constants A very long insulating cylinder of charge of radius 2.60 cm carries a uniform linear density of 14.0 nC/m f you put one probe of a voltmeter at the surface, how far from the surface must the other probe be placed so that the voltmeter reads 150 V ? cm

Answer 1

The voltmeter reads the potential difference between the two points where the probes are placed.Therefore we must relate the potential difference to the distances of these points from the center of the cylinder.For points outside the cylinder,its electric field behaves like that of a line of charge.