﻿ Electric Fields - Show Me The Physics

Electric Potential Lesson - showmethephysics.com

Lightning over the Icelandic volcano 2010

NASA

G) Electric Field - region in space where electric forces act on charges

 "Did you know that sharks can 'see' electric fields?"

School Blocks YouTube? Use file below.

Electroreception (right click, save as)

ElectroreceptionShark.htm

A bonnethead shark biting actively and vigorously at various electric dipoles while ignoring the live fish swimming around with it.

Dr. Stephen M. Kajiura,  Elasmobranch Research Lab,  Boca Raton, FL

1) Vector Quantity

2)  E = F/q  (on reference)

E = Electric Field Strength (N/C)
q = amount of charge
F = force on charge

 AP Physics B Giancoli p. 466) 31 E = F/q = ma/q   E = F/q = Kq/r2  33) Corner charges cancel out  E = F/q = Kq/r2

3) The direction of an electric field is drawn to show how the field acts on positive charge (Decided by convention)

Positive Spherical Charges Repel Positives
Outward in all Directions

[ Flash ]

Negative Spherical Charges Drawn Positives
In Toward the Center of the Charge

Electric Field Patterns

Spherical Charges

 a) positive charge b) negative charge ou+ in

Field at the
center of a charge
= zero

What is the charge below - Negative, Positive or Neutral?

 c) 2 opposite charges

3 Dimensional View

 d) 2 like charges

e) Field between a positive and neutral charge

 Which charge is positive?

f) Field Lines between opposite charged parallel plates

** Field between plates is uniform

- (same strength all over)

Field Lines
M.S.U.

Charges and Fields
Physics 2000

Charges and Fields Part II
Physics 2000

Review

Identify the incorrect choices below.
Justify each choice

June 2013

Name the charges.

June 2016