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 $\alpha$. The spheres are now immersed in a dielectric liquid of density $800 \mathrm{~kg} \mathrm{~m}^{-3}$ and dielectric constant 21. If the angle between the strings remains the same after the immersion, then
Select ALL correct options:
A
electric force between the spheres remains unchanged
B
electric force between the spheres reduces
C
mass density of the spheres is $840 \mathrm{~kg} \mathrm{~m}^{-3}$
D
the tension in the strings holding the spheres remains unchanged
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
⚠ Partially correct. Some answers are missing.
Solution
The net electric force on any sphere is lesser but by Coulomb law the force due to one sphere to another remain the same.
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