Related InterviewSolutions

• The two metallic plates of radius `r` are placed at a distance `d` apart and its capacity is `C`. If a plate of radius `r//2` and thickness `d`of dielectric constant `6` is placed between the plates of the condenser, then its capacity will beA. 7C/2B. 3C/7C. 7C/3D. 9C/4
• At which of the two points, `1` or `2`, of a charged capacitor with nonparallel plates is the surface charge density greater?
• Shows the variation of voltage `V` across the plates of two capacitors `A and B` versus incease in charge Q stored in them. Which of the capacitors has higher capacitance? Give reason for your answer. .
• The charged plates of a capacitor attract each other. So work by some external force is required to pull the plates farther apart. What happens to the energy added by this work.
• A parallel plate air capacitor is connected to a battery. If the plates of the capacitor are pulled farther apart, then state whether the following statements are true or false. a. Strength of the electric field inside the capacitor remains unchanged, if the battery is disconnected before pulling the plates. b. During the process, work is done by the external force applied to pull the plates irrespective of whether the battery is disconnected or not. c. Strain energy in the capacitor decreases if the battery remains connected. .
• An isolated coductor, initially free from charge, is charge by repeated conacts with a plate, which afrer each contact has a charge Q due to some mechanism.If q is the charge on the conductor after the first operation, prove that the maximum charge that can be give to the conductor in this way is `Qq//Q-q`.
• a. How many excess electrons must be added to one plate and removed from the other to give a `5.000 nF` parallel plate capacitor `25.0 J` of stored energy ? b. How could you modify the geometry of this capacitor so that can store `50.0 J` of energy without changing the charge on its plates?
• An uncharged parallel plate capacitor is connected to a battery. The electric field between the plates is 10V/m. Now a dielectric of dielectric constant 2 is inserted between the plates filling the entries space. The electric field between the plates now isA. 5 V/mB. 20 V/mC. 10 V/mD. none of these
• The plates of a parallel plate capacitor with no dielectirc are connected to a volatage source. Now a dielectric of dielectric constant `K` is inserted to fill the whose space between the plates with voltage source remainign connected to the capacitor-A. The energy stored in the capacitor will become will decrease k timesB. The electric field of inside the capacitor will decrease k timesC. The force of attration between the plates will become `K^(2)` timesD. The charge on the capacitor will become will k times
• The capacitor and the energy stored on a paralle plate concenser with air between its plates are respectively `C_(0)` and `W_(0)`.If the air is replaced by glass (dieletric constant =5) between the plates, the capacity of the plates and the energy stored in it will respectively beA. `5C_(0).5W_(0)`B. `5C_(0),(W_(0))/(5)`C. `(C_(0))/(5),5W_(0)`D. `(C_(0))/(5),(W_(0))/(5)`