AP Physics 2 / Unit 10: Electric Force, Field, and Potential
10.5 Electric Potential
Notes
$$V=k\frac{q}{r},\qquad \Delta U=q\Delta V$$
- Unit: volt = J/C.
- Equipotential lines are perpendicular to field lines.
- In a uniform field: $\displaystyle E=\frac{\Delta V}{d}$.
Practice
A 2 C charge moves through 6 V. Energy change:
$q\Delta V$.
Plates 0.01 m apart with 100 V between them. $E=$
$\displaystyle \frac{100}{0.01}$.
Moving a charge along an equipotential line takes:
$\Delta V=0$.
Ready for more? Take the Unit 10 test.