The correct expression for the potential at a point distance r from a charge q in an electric field is?
| _q2 |
| 4πεor2 |
| _q2 |
| 4πεor |
| _q |
| 4πεor2 |
A length of wire has a frequency of 225Hz when stretched by a force of 225N. If the force increased to 324N, what is the new frequency of vibration?
In the circuit above, three resistors, 2Ω, 4Ω and 12Ω are connected in parallel and a 12V battery is connected across the combination. The current flowing through the 12Ω resistors is
