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Intro. to Elect 03
CO1_Introduction to Electricity - Electric Fields: Extended Sources - #3
| Question | Answer |
|---|---|
| Line of Charge (Definition) | A continuous distribution of charge along a straight line. |
| Linear Charge Density (λ) | Charge per unit length, λ = Q/L. |
| Electric Field of a Line of Charge | Field magnitude decreases as 1/r for long lines of charge. |
| Symmetry of Line Charge Field | Field points radially outward (positive λ) or inward (negative λ). |
| Charged Disk (Definition) | A flat circular region with uniformly distributed charge. |
| Electric Field of a Charged Disk | Field is strongest at the center and decreases with distance along the axis. |
| Disk Field Far Away | At large distances, a charged disk behaves like a point charge. |
| Surface Charge Density (σ) | Charge per unit area, σ = Q/A. |
| Point Charge in an External Field | A point charge experiences force F = qE. |
| Direction of Force on a Charge | Positive charges move with the field; negative charges move opposite. |
| Dipole in an External Field | A dipole experiences both a net torque and possibly a net force. |
| Dipole Torque Formula | τ = pE sinθ, where p is the dipole moment. |
| Dipole Alignment | A dipole tends to rotate to align with the electric field. |
| Dipole in Non‑Uniform Field | A dipole can experience a net force in a non‑uniform electric field. |
| Dipole Moment (p) | A vector quantity defined as p = qd, pointing from − to + charge. |
Created by:
frankie gabriel slavin