Q .     An infinite line charge of uniform electric charge density `\lambda` lies along the axis electrically conducting infinite cylindrical shell of radius `R`. At time `t = 0`, the space in the cylinder is filled with a material of permittivity `\varepsilon` and electrical conductivity `\sigma`. The electrical conduction in the material follows Ohm's law. Which one of the following best describes the subsequent variation of the magnitude of current density j(t) at any in the material?

JEE 2016 ADVANCED Paper 1
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