Exams › NEET › Physics
A capacitor is charged to store an energy U. The charging battery is disconnected. An identical capacitor is now connected to the first capacitor in parallel. The energy in each of the capacitor is
- U/2
- 3U/2
- U
- U/4
Correct answer: U/2
Solution
When the second identical capacitor is connected in parallel, the total capacitance doubles, and the charge redistributes equally between the two capacitors. Since energy is proportional to the square of the charge, the energy in each capacitor becomes U/2.
Related NEET Physics questions
- A positively charged rod is brought near an uncharged conductor. If the rod is then suddenly withdrawn, the charge left on the conductor will be :
- Two metal spheres, one of radius R and the other of radius 2R respectively have the same surface charge density σ. They are brought in contact and separated. What will be the new surface charge densities on them?
- In a region, the potential is represented by V(x, y, z) = 6x − 8xy − 8y + 6yz, where V is in volts and x, y, z are in meters. The electric force experienced by a charge of 2 coulomb situated at point (1, 1, 1) is:
- If potential (in volts) in a region is expressed as V(x, y, z) = 6xy − y + 2yz, the electric field (in N/C) at point (1, 1, 0) is:
- What is the electrostatic force between the metal plates of a capacitor?
- When a proton is accelerated through \( 1 \, \text{V} \), then its kinetic energy will be
⚔️ Practice NEET Physics free + battle 1v1 →