Q16.Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30∘ with each other. When suspended in a liquid of density 0.8 g cm−3 , the angle remains the same. If density of the material of the sphere is 16 g cm−3 , the dielectric constant of the liquid is (1) 4 (2) 3 (3) 2 (4) 1
What This Question Tests
This question tests the understanding of how electrostatic forces are modified in a dielectric medium and how to incorporate buoyancy forces in equilibrium problems.
Concepts Tested
Formulas Used
F_electrostatic = (1/(4πε₀K)) * (q₁q₂/r²)
F_buoyancy = V_sphere * ρ_liquid * g
Weight = V_sphere * ρ_sphere * g
tanθ = F_electrostatic / (mg - F_buoyancy)
📚 NCERT Sections This Tests
2.1 — Two Charges 5 × 10–8 C And –3 × 10–8 C Are Located 16 Cm Apart. At
Physics Class 11 · Chapter 2
2.1 Two charges 5 × 10–8 C and –3 × 10–8 C are located 16 cm apart. At what point(s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero.
2.4 — A Spherical Conductor Of Radius 12 Cm Has A Charge Of 1.6 × 10–7C
Physics Class 11 · Chapter 2
2.4 A spherical conductor of radius 12 cm has a charge of 1.6 × 10–7C distributed uniformly on its surface. What is the electric field (a) inside the sphere (b) just outside the sphere (c) at a point 18 cm from the centre of the sphere?
2.10 — Dielectrics And Polarisation
Physics Class 11 · Chapter 2
2.10 DIELECTRICS AND POLARISATION Dielectrics are non-conducting substances. In contrast to conductors, they have no (or negligible number of ) charge carriers. Recall from Section
📋 Question Details
- Chapter
- Electrostatics
- Topic
- Coulomb's Law in dielectric medium and Buoyancy
- Year
- 2010
- Shift
- Unknown
- Q Number
- Q16
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 1: Electric Charges and Fields
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