TS EAMCET · Physics · Electrostatics
729 small identical spheres each charged to an electric potential 3V combine to form a bigger sphere. The electric potential of the bigger sphere is
- A \(9 V\)
- B \(729 V\)
- C \(81 V\)
- D \(243 V\)
Answer & Solution
Correct Answer
(D) \(243 V\)
Step-by-step Solution
Detailed explanation
\( V_b = n^{2/3} V_s \) \( V_b = (729)^{2/3} \times 3 V \) \( V_b = 81 \times 3 V \) \( V_b = 243 V \)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- Find the current in the three resistors as shown in the following figure?
TS EAMCET 2022 Medium - A pendulum has a time period \(\mathrm{T}\) in air. When it is made to oscillate in water its time period is \(\sqrt{2} \mathrm{~T}\). Then the relative density of the material of the bob of the pendulum is (neglect damping)TS EAMCET 2023 Medium
- In a travelling plane electromagnetic wave, the maximum magnetic field is \(1.26 \times 10^{-4} \mathrm{~T}\). The intensity of the wave is (Assume, \(\mu_0=1.26 \times 10^{-6} \mathrm{H} / \mathrm{m}\) )TS EAMCET 2019 Easy
- A wheel of radius with 0.5 m and a moment of inertia of 10 kg. m2 is rotating freely at an angular speed of 70 rev/min. The wheel can be stopped in 5.0 s by pressing a wet cloth against the rim and exerting a radially inward force of 88 N. The coefficient of kinetic friction between the wheel and wet cloth isTS EAMCET 2022 Hard
- A coil has a resistance of \(30 \Omega\) and an inductive reactance of \(20 \Omega\) at \(50 \mathrm{~Hz}\) frequency. If an AC source of \(200 \mathrm{~V}\), \(100 \mathrm{~Hz}\) is connected across the coil, the current in the coil isTS EAMCET 2023 Easy
- The amplitude of the electric field associated with a light beam of intensity \(\frac{15}{\pi} \mathrm{Wm}^{-2}\) isTS EAMCET 2025 Medium
More PYQs from TS EAMCET
- A sphere '1' with radius \(\mathrm{R}\) has charge \(\mathrm{q}\). Sphere '2' with radius \(3 \mathrm{R}\) is far from sphere ' 1 ' and is initially uncharged. If the two spheres are now connected with a thin conducting wire, then the ratio \(\frac{\sigma_1}{\sigma_2}\) of the surface charge densities isTS EAMCET 2022 Medium
- A monochromatic light of wavelength \(\lambda\) ejects photoelectrons from a metal surface with work function \((\phi) 2.4 \mathrm{eV}\). These photoelectrons are made to collide with hydrogen atoms in ground state. The maximum value of \(\lambda\) for which hydrogen atom may be ionised is [take, \(h c=1240 \mathrm{eV}-\mathrm{nm}\) ]TS EAMCET 2020 Easy
- Consider a spherical drop of mercury of radius with capacitance If two such droplets combine to form a larger one, what would be its capacitance in terms of ?TS EAMCET 2021 Medium
- Consider a parallel plate capacitor which is maintained at potential \(200 \mathrm{~V}\). The separation distance between the plates of capacitor and the area of plates are \(1 \mathrm{~mm}\) and \(20 \mathrm{~cm}^2\), respectively. Calculate displacement current in \(1 \mu \mathrm{s}\).TS EAMCET 2020 Hard
- An ideal gas having initial pressure \(\mathrm{P}\), volume \(\mathrm{V}\) and temperature \(\mathrm{T}\) is allowed to expand adiabatically until its volume becomes \(4 \mathrm{~V}\), while its temperature falls to \(\frac{\mathrm{T}}{2}\). If the work done by the gas during the expansion is \(\alpha \mathrm{PV}\), the value of \(\alpha\) isTS EAMCET 2022 Easy
- Choose correct statement (A) The position of centre of mass of a system is dependent on the choice of coordinate system. (B) Newton's second law of motion is applicable to the centre of mass of the system. (C) Internal forces can not change the state of centre of mass. (D) Internal forces can change the state of centre of mass.TS EAMCET 2012 Medium