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Q#1 Electrostatics GATE EE 2020 MCQ +2 marks -0.66 marks

The static electric field inside a dielectric medium with relative permittivity, , expressed in cylindrical coordinate system is given by the following expression

where , ,  are unit vectors along r,  and z directions, respectively. If the above expression represents a valid electrostatic field inside the medium, then the volume charge density associated with this field in terms of free space permittivity, , in SI units is given by:

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