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Electric Field Lines and Electropotential Lines\Surfaces Electric Field Lines All electric charges have invisible electric field lines surrounding them. The source of these lines is uncertain; however, they are definitely present. The electric field lines of a positive charge radiates outward in all directions from the charge. The electric field lines of a negative charge radiates inward from all directions. A positive charge released in the vicinity of an electric charge would move in the direction indicated by the direction of the electric field lines. Negative charges would move in the opposite direction as the electric filed lines. Equipotential Surfaces The red lines on this slide are electric field lines. Equipotential Surfaces indicate positions in an electric field where the electric potential (Voltage) is constant. These equipotential surfaces within a uniform electric field are indicated by the blue lines in the figure to the right. The equipotential surfaces about an isolated point charge would be as shown. Equipotential Surfaces for a Dipole The equipotential surfaces for a dipole would look those appearing in the figure to the right. Procedure 1: Multimeter/Probes Procedure 3 – Parallel Plate Capacitor Procedure 1: Voltage Measurement Procedure 4 - Electric Field Conducting Ring I Procedure 1 – Equipotential Surfaces/Lines Procedure 4 - Electric Field Conducting Ring II Procedure 1 - Plotting Equipotential Lines/Surfaces Procedure 5 - Electric Field Capacitor with Insulator Procedure 2 - Plotting Electric Fields Procedure 5 - Electric Field Like Charged Dipole MAX/MIN HOLD OFF 200 20 750 MAX/MIN OFF 1000 750 200 20 2 200m 2 200m 200 10A 200m 200 10A 200m Hz 1000 200 20 2000m 200m 200 20 2000m 200m 40kHz 200 200 20m 20m Logic 200 2K 20 2 200n 20n 2n PNP PNP hFE 200K 20M 2000M 200m 200m 200 750 20m 2m 200 200 1400 20M 200k 2k 200 This slide shows you how to remove the caps from the probes and insert them into the multimeter. When you remove them from the probes, place them in the Laboratory kit to avoid loosing the caps. MAX/MIN OFF 750 1000 200 20 2000m 200m 200 20 2000m 200m 40kHz 200 200 20m 20m 200m 200m 200 750 20m 2m 200 200 1400 20M 200k 2k 200 Return MAX/MIN HOLD OFF 200 20 750 MAX/MIN OFF 1000 750 200 20 2 200m 2 200m 200 10A 200m 1000 200 20 2000m 200m 200 10A 200m Hz 200 20 2000m 200m 40kHz 200 200 20m 20m Logic 2K 20 2 200n 20n 2n PNP PNP hFE 200m 200m 200 200 750 20m 200K 20M 2000M 2m 200 200 1400 20M 200k 2k 200 Return Procedure 1- Equipotential Surfaces/Lines 20 A 18 16 14 B C D E H I 12 10 8 6 4 F G 2 0 2 4 6 8 10 12 14 Return 16 18 20 22 24 26 28 Procedure 1 - Plotting Equipotential Lines/Surfaces B C Return Procedure 2 - Plotting Electric Fields a b c e d Procedure 2 - Plotting Electric Fields B C Return Procedure 3 – Parallel Plate Capacitor a b H c I d e Return Procedure 4 - Electric Field Capacitor with Insulator a b D c E d e Return Procedure 4 - Electric Field Electric Field Conducting Ring a b F c G d e Return Procedure 4 - Electric Field Like Charged Dipole A B a c b d Return C Procedure 4 - Electric Field Conducting Ring b F c c’ b’ d’ a’ e’ g’ f’ a g f Return d G e e- + Scale: 2 Squares = 1 cm -
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