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Electrostatics question

2020 · Shift 2 · Q47
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Electrostatics question

2020 · Shift 2 · Q47

JEE AdvancedPhysicsElectrostaticsMultiple correct+4 / −2
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\alphaα. 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
  1. A
    electric force between the spheres remains unchanged
  2. B
    electric force between the spheres reduces
  3. C
    mass density of the spheres is 840 kg m −-− 3
  4. D
    the tension in the strings holding the spheres remains unchanged
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