JEE Advanced 2020 Physics question
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 . The spheres are now immersed in a dielectric liquid of density and dielectric constant 21. If the angle between the strings remains the same after the immersion, then
Answer: (B),(C)
Solution
In air: , . In the liquid the separation is the same (same angle), so the electric force becomes – it reduces: (B) is correct, (A) is wrong. The effective weight becomes
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