JAMB - Physics (2011 - No. 42)
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 |
\(\frac{q}{4πε_or}\)
Vysvětlení
Electric potential is work done in taking a unit mass or charge from infinity to that point
| V = | w | = | Fr | = | Q1Q2 | x | r |
| Q | Q | 4πεor2 | Q1 |
| = | _q |
| 4πεor |