Discussion
The INCORRECT formula representing the energy stored in a parallel plate capacitor in usual notation is
Answer: D
The incorrect formula is \(\frac{1}{2}C^{2}V\).
The energy stored is \(U = \frac{1}{2}QV\). With Q = CV it becomes \(\frac{1}{2}CV^{2}\) and \(\frac{Q^{2}}{2C}\). In terms of the field, the energy density \(\frac{1}{2}\varepsilon_0E^{2}\) times the volume Ad gives \(\frac{1}{2}\varepsilon_0E^{2}Ad\).
\(\frac{1}{2}C^{2}V\) has the wrong dimensions (it equals \(\frac{1}{2}CQ\)), so it cannot be an energy.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development