CUET · PHYSICS · PYQ PAPER 2023
A parallel plate capacitor whose capacitance C is 13.0 pF is charged by a battery to a potential difference V = 13.0 V between its plates. What is the potential energy of the capacitor ?
- A 1.098 nJ
- B 2197 pF
- C 1.98 pJ
- D 2.197 nJ
Answer & Solution
Correct Answer
(A) 1.098 nJ
Step-by-step Solution
Detailed explanation
\( U = \frac{1}{2} C V^2 \) \( U = \frac{1}{2} (13.0 \times 10^{-12} \text{ F}) (13.0 \text{ V})^2 \) \( U = 1.0985 \times 10^{-9} \text{ J} = 1.0985 \text{ nJ} \)
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
- The work function for Tungsten and Sodium are 4.2 eV and 2.3 eV, respectively. If the threshold wavelength for Sodium is 5460 \(\text{\AA}\), then that for tungsten is :CUET 2023 Easy
- Which of the following statements are correct?
A. The number of photoelectrons emitted per second is directly proportional to the intensity of incident radiation.
B. The minimum value of photoelectric current is called saturation current.
C. For a given frequency, stopping potential is independent of its intensity.
D. The stopping potential is same for all frequencies.CUET 2023 Easy - In a transistor :
(A) one of the outer layers is heavily doped and is called collector
(B) one of the outer layers is heavily doped and is called emitter
(C) the middle layer is very lightly doped and is called base
(D) one of the outer layer is moderately doped and is called emitter
(E) one of the outer layer is moderately doped and is called collector
Choose the correct answer from the options given below :CUET 2023 Easy - Which of the following statement is incorrect about the magnetic field?CUET 2023 Hard
- A current element \(\Delta \vec{l}=\Delta x \hat{i}\) (where \(\Delta x=1 cm\) ) is placed at the origin and carries a current 10 A . The magnetic field on y -axis at a distance of 0.5 m is :CUET 2023 Hard
- Two large plane parallel sheets with equal but opposite surface charge densities +\(\sigma\) and -\(\sigma\). A point charge q placed at points \(P_1, P_2,\) and \(P_3\) experiences forces \(F_1, F_2,\) and \(F_3\) respectively. Then :CUET 2024 Easy
More PYQs from CUET
- A battery of emf 12 V and internal resistance \(3 \Omega\) is connected to a resistor. If the current in the circuit is 0.8 A, the terminal voltage of the battery, will beCUET 2025 Medium
- A single stranded DNA or RNA tagged with a radioactive probe is allowed to hybridize to its complementary DNA in a clone of cells followed by detection using __________.CUET 2025 Medium
- What is the power factor of an ac circuit having resistance R and inductance L connected in series? (\( \omega \) is the angular frequency )CUET 2023 Easy
- A galvanometer has a resistance of \(8 \Omega\). It is shunted by a wire of resistance \(2 \Omega\). If the total current is 2 A, the current passing through the shunt isCUET 2025 Hard
- The rate constants of the reaction at 100 K and 200 K are \(0.01 s^{-1}\) and \(0.02 s^{-1}\) respectively.
The value of activation energy ( \(E_a\) ) will be
\((\log 2=0.3010)\)CUET 2025 Easy -
The reaction shown above is known asCUET 2025 Medium