University:
University of Cambridge
Course:
0625 IGCSE | Physics
Academic year:

2023
Views:

80

Pages:

2
Author:

Deddy A.

Electric field lines are very helpful. We can represent an electric field by drawing electric field lines. Field lines satisfy the following rules: (E) 1. Field lines at a point are along (tangent to) the electric field vector at that point. (+) (-) 2. Field lines begin on positive charges and end on negative charges. 3. The number of lines leaving a positive charge or ending on a negative charge is proportional to the magnitude of the charge. For a positive point charge. the lines radiate outward For a negative point charge. the lines converge inward Rank the magnitudes of the electric field at points A, B, and C in the figure, from largest to smallest. A, B, C b) A, C, B c) C, B, A d) C, A, B online Chapter 16 vector component of E WAB = FAT = qEATAKE-direction A40B کی ↓=-APE (can be charge displacement, unlike mag. Electrical Energy & Capacitance High PE Low PE ★ electric force is conservative, so e work depends ONLY on the path's endpoints. of E) Figure 16.1 When a charge moves in a uniform electric field E from point A to point B, the work done on the charge by the electric force is * eq. ONLY valid for a uniform/constant e. field When a positive test charge moves from A to 8, the electric potential energy decreases. When an object with mass moves from A to A, the gravitational potential energy decreases. ΔΚΕ + ΔΡΕ – ΔΚΕ + (0-1g|Ed) = 0 ↓ gained by falling from charge can only A to B be (+) AKE = qEd AKE = APE ↓ 10ss of electric PE. ΔΚΕ + ΔΡΕ - ΔΚE+(0mgd)0→AKE = mgd OKE-OPE for potential energy in both Figures 16.2a and 16.26, From the conservation of energy in falling from point A to point & the positive charge gains kinetic energy equal in magnitude to the loss of electric potential energy: W = mv2 + q Ed 1 2 loss of gravitational PE