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 1: Voltage Measurement Procedure 1 – Equipotential Surfaces/Lines Procedure 5 - Electric Field Capacitor with Insulator Procedure 2 - Plotting Electric Fields Procedure 3 – Parallel Plate Capacitor Procedure 4 - Electric Field Conducting Ring I Procedure 5 - Electric Field Like Charged Dipole Procedure 1 - Plotting Equipotential Lines/Surfaces Procedure 4 - Electric Field Conducting Ring II

1000 OFF m m 2K K 20M 20n 2n PNP Logic 200n 22 20  A Hz 2000M 200m A hFE MAX/MINHOLD 1000 OFF m 200m m 200m 200  20m 200m kHz 20M 200k 2k  20m 200m 200  2m 20m MAX/MIN

1000 OFF m 200m m 200m 200  20m 200m kHz 20M 200k 2k  20m 200m 200  2m 20m MAX/MIN 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. Return

1000 OFF m m 2K K 20M 20n 2n PNP Logic 200n 22 20  A Hz 2000M 200m A hFE MAX/MINHOLD 1000 OFF m 200m m 200m 200  20m 200m kHz 20M 200k 2k  20m 200m 200  2m 20m MAX/MIN Return

A BCED IHGF Procedure 1- Equipotential Surfaces/Lines Return

Procedure 1 - Plotting Equipotential Lines/Surfaces BC Return

Procedure 2 - Plotting Electric Fields ab c d e

BC Return

Procedure 3 – Parallel Plate Capacitor IH a b c d e Return

Procedure 4 - Electric Field Capacitor with Insulator a b c d e ED Return

Procedure 4 - Electric Field Electric Field Conducting Ring a b c d e GF Return

Procedure 4 - Electric Field Like Charged Dipole ABC a b c d Return

Procedure 4 - Electric Field Conducting Ring a b c d GF Return g f e a’ g’ f’ e’ d’ c’ b’

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Scale: 2 Squares = 1 cm +-