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JEE Advanced 2020 Paper 2

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Question : 11

Total: 54

Two identical non-conducting solid spheres of same mass and charge are suspended in air from a common point by two non-conducting, massless strings of same length. At equilibrium, the angle between the strings is α. The spheres are now immersed in a dielectric liquid of density 800 kg m−3 and dielectric constant 21. If the angle between the strings remains the same after the immersion, then

[JEE Adv 2020 P2]

electric force between the spheres remains unchanged
electric force between the spheres reduces
mass density of the spheres is 840 kg m‌−3
the tension in the strings holding the spheres remains unchanged

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